Initial import

1 files changed, 3146 insertions, 0 deletions

diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
new file mode 100644
index 000000000..209166429
--- /dev/null
+++ b/net/xfrm/xfrm_user.c
@@ -0,0 +1,3146 @@
+/* xfrm_user.c: User interface to configure xfrm engine.
+ *
+ * Copyright (C) 2002 David S. Miller (davem@redhat.com)
+ *
+ * Changes:
+ *	Mitsuru KANDA @USAGI
+ * 	Kazunori MIYAZAWA @USAGI
+ * 	Kunihiro Ishiguro <kunihiro@ipinfusion.com>
+ * 		IPv6 support
+ *
+ */
+
+#include <linux/crypto.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/socket.h>
+#include <linux/string.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/pfkeyv2.h>
+#include <linux/ipsec.h>
+#include <linux/init.h>
+#include <linux/security.h>
+#include <net/sock.h>
+#include <net/xfrm.h>
+#include <net/netlink.h>
+#include <net/ah.h>
+#include <asm/uaccess.h>
+#if IS_ENABLED(CONFIG_IPV6)
+#include <linux/in6.h>
+#endif
+
+static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
+{
+	struct nlattr *rt = attrs[type];
+	struct xfrm_algo *algp;
+
+	if (!rt)
+		return 0;
+
+	algp = nla_data(rt);
+	if (nla_len(rt) < xfrm_alg_len(algp))
+		return -EINVAL;
+
+	switch (type) {
+	case XFRMA_ALG_AUTH:
+	case XFRMA_ALG_CRYPT:
+	case XFRMA_ALG_COMP:
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
+	return 0;
+}
+
+static int verify_auth_trunc(struct nlattr **attrs)
+{
+	struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
+	struct xfrm_algo_auth *algp;
+
+	if (!rt)
+		return 0;
+
+	algp = nla_data(rt);
+	if (nla_len(rt) < xfrm_alg_auth_len(algp))
+		return -EINVAL;
+
+	algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
+	return 0;
+}
+
+static int verify_aead(struct nlattr **attrs)
+{
+	struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
+	struct xfrm_algo_aead *algp;
+
+	if (!rt)
+		return 0;
+
+	algp = nla_data(rt);
+	if (nla_len(rt) < aead_len(algp))
+		return -EINVAL;
+
+	algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
+	return 0;
+}
+
+static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
+			   xfrm_address_t **addrp)
+{
+	struct nlattr *rt = attrs[type];
+
+	if (rt && addrp)
+		*addrp = nla_data(rt);
+}
+
+static inline int verify_sec_ctx_len(struct nlattr **attrs)
+{
+	struct nlattr *rt = attrs[XFRMA_SEC_CTX];
+	struct xfrm_user_sec_ctx *uctx;
+
+	if (!rt)
+		return 0;
+
+	uctx = nla_data(rt);
+	if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
+		return -EINVAL;
+
+	return 0;
+}
+
+static inline int verify_replay(struct xfrm_usersa_info *p,
+				struct nlattr **attrs)
+{
+	struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
+	struct xfrm_replay_state_esn *rs;
+
+	if (p->flags & XFRM_STATE_ESN) {
+		if (!rt)
+			return -EINVAL;
+
+		rs = nla_data(rt);
+
+		if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
+			return -EINVAL;
+
+		if (nla_len(rt) < xfrm_replay_state_esn_len(rs) &&
+		    nla_len(rt) != sizeof(*rs))
+			return -EINVAL;
+	}
+
+	if (!rt)
+		return 0;
+
+	/* As only ESP and AH support ESN feature. */
+	if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
+		return -EINVAL;
+
+	if (p->replay_window != 0)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int verify_newsa_info(struct xfrm_usersa_info *p,
+			     struct nlattr **attrs)
+{
+	int err;
+
+	err = -EINVAL;
+	switch (p->family) {
+	case AF_INET:
+		break;
+
+	case AF_INET6:
+#if IS_ENABLED(CONFIG_IPV6)
+		break;
+#else
+		err = -EAFNOSUPPORT;
+		goto out;
+#endif
+
+	default:
+		goto out;
+	}
+
+	err = -EINVAL;
+	switch (p->id.proto) {
+	case IPPROTO_AH:
+		if ((!attrs[XFRMA_ALG_AUTH]	&&
+		     !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
+		    attrs[XFRMA_ALG_AEAD]	||
+		    attrs[XFRMA_ALG_CRYPT]	||
+		    attrs[XFRMA_ALG_COMP]	||
+		    attrs[XFRMA_TFCPAD])
+			goto out;
+		break;
+
+	case IPPROTO_ESP:
+		if (attrs[XFRMA_ALG_COMP])
+			goto out;
+		if (!attrs[XFRMA_ALG_AUTH] &&
+		    !attrs[XFRMA_ALG_AUTH_TRUNC] &&
+		    !attrs[XFRMA_ALG_CRYPT] &&
+		    !attrs[XFRMA_ALG_AEAD])
+			goto out;
+		if ((attrs[XFRMA_ALG_AUTH] ||
+		     attrs[XFRMA_ALG_AUTH_TRUNC] ||
+		     attrs[XFRMA_ALG_CRYPT]) &&
+		    attrs[XFRMA_ALG_AEAD])
+			goto out;
+		if (attrs[XFRMA_TFCPAD] &&
+		    p->mode != XFRM_MODE_TUNNEL)
+			goto out;
+		break;
+
+	case IPPROTO_COMP:
+		if (!attrs[XFRMA_ALG_COMP]	||
+		    attrs[XFRMA_ALG_AEAD]	||
+		    attrs[XFRMA_ALG_AUTH]	||
+		    attrs[XFRMA_ALG_AUTH_TRUNC]	||
+		    attrs[XFRMA_ALG_CRYPT]	||
+		    attrs[XFRMA_TFCPAD]		||
+		    (ntohl(p->id.spi) >= 0x10000))
+			goto out;
+		break;
+
+#if IS_ENABLED(CONFIG_IPV6)
+	case IPPROTO_DSTOPTS:
+	case IPPROTO_ROUTING:
+		if (attrs[XFRMA_ALG_COMP]	||
+		    attrs[XFRMA_ALG_AUTH]	||
+		    attrs[XFRMA_ALG_AUTH_TRUNC]	||
+		    attrs[XFRMA_ALG_AEAD]	||
+		    attrs[XFRMA_ALG_CRYPT]	||
+		    attrs[XFRMA_ENCAP]		||
+		    attrs[XFRMA_SEC_CTX]	||
+		    attrs[XFRMA_TFCPAD]		||
+		    !attrs[XFRMA_COADDR])
+			goto out;
+		break;
+#endif
+
+	default:
+		goto out;
+	}
+
+	if ((err = verify_aead(attrs)))
+		goto out;
+	if ((err = verify_auth_trunc(attrs)))
+		goto out;
+	if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
+		goto out;
+	if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
+		goto out;
+	if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
+		goto out;
+	if ((err = verify_sec_ctx_len(attrs)))
+		goto out;
+	if ((err = verify_replay(p, attrs)))
+		goto out;
+
+	err = -EINVAL;
+	switch (p->mode) {
+	case XFRM_MODE_TRANSPORT:
+	case XFRM_MODE_TUNNEL:
+	case XFRM_MODE_ROUTEOPTIMIZATION:
+	case XFRM_MODE_BEET:
+		break;
+
+	default:
+		goto out;
+	}
+
+	err = 0;
+
+out:
+	return err;
+}
+
+static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
+			   struct xfrm_algo_desc *(*get_byname)(const char *, int),
+			   struct nlattr *rta)
+{
+	struct xfrm_algo *p, *ualg;
+	struct xfrm_algo_desc *algo;
+
+	if (!rta)
+		return 0;
+
+	ualg = nla_data(rta);
+
+	algo = get_byname(ualg->alg_name, 1);
+	if (!algo)
+		return -ENOSYS;
+	*props = algo->desc.sadb_alg_id;
+
+	p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
+	if (!p)
+		return -ENOMEM;
+
+	strcpy(p->alg_name, algo->name);
+	*algpp = p;
+	return 0;
+}
+
+static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
+		       struct nlattr *rta)
+{
+	struct xfrm_algo *ualg;
+	struct xfrm_algo_auth *p;
+	struct xfrm_algo_desc *algo;
+
+	if (!rta)
+		return 0;
+
+	ualg = nla_data(rta);
+
+	algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
+	if (!algo)
+		return -ENOSYS;
+	*props = algo->desc.sadb_alg_id;
+
+	p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
+	if (!p)
+		return -ENOMEM;
+
+	strcpy(p->alg_name, algo->name);
+	p->alg_key_len = ualg->alg_key_len;
+	p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
+	memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
+
+	*algpp = p;
+	return 0;
+}
+
+static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
+			     struct nlattr *rta)
+{
+	struct xfrm_algo_auth *p, *ualg;
+	struct xfrm_algo_desc *algo;
+
+	if (!rta)
+		return 0;
+
+	ualg = nla_data(rta);
+
+	algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
+	if (!algo)
+		return -ENOSYS;
+	if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
+		return -EINVAL;
+	*props = algo->desc.sadb_alg_id;
+
+	p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
+	if (!p)
+		return -ENOMEM;
+
+	strcpy(p->alg_name, algo->name);
+	if (!p->alg_trunc_len)
+		p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
+
+	*algpp = p;
+	return 0;
+}
+
+static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
+		       struct nlattr *rta)
+{
+	struct xfrm_algo_aead *p, *ualg;
+	struct xfrm_algo_desc *algo;
+
+	if (!rta)
+		return 0;
+
+	ualg = nla_data(rta);
+
+	algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
+	if (!algo)
+		return -ENOSYS;
+	*props = algo->desc.sadb_alg_id;
+
+	p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
+	if (!p)
+		return -ENOMEM;
+
+	strcpy(p->alg_name, algo->name);
+	*algpp = p;
+	return 0;
+}
+
+static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
+					 struct nlattr *rp)
+{
+	struct xfrm_replay_state_esn *up;
+	int ulen;
+
+	if (!replay_esn || !rp)
+		return 0;
+
+	up = nla_data(rp);
+	ulen = xfrm_replay_state_esn_len(up);
+
+	if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
+				       struct xfrm_replay_state_esn **preplay_esn,
+				       struct nlattr *rta)
+{
+	struct xfrm_replay_state_esn *p, *pp, *up;
+	int klen, ulen;
+
+	if (!rta)
+		return 0;
+
+	up = nla_data(rta);
+	klen = xfrm_replay_state_esn_len(up);
+	ulen = nla_len(rta) >= klen ? klen : sizeof(*up);
+
+	p = kzalloc(klen, GFP_KERNEL);
+	if (!p)
+		return -ENOMEM;
+
+	pp = kzalloc(klen, GFP_KERNEL);
+	if (!pp) {
+		kfree(p);
+		return -ENOMEM;
+	}
+
+	memcpy(p, up, ulen);
+	memcpy(pp, up, ulen);
+
+	*replay_esn = p;
+	*preplay_esn = pp;
+
+	return 0;
+}
+
+static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
+{
+	int len = 0;
+
+	if (xfrm_ctx) {
+		len += sizeof(struct xfrm_user_sec_ctx);
+		len += xfrm_ctx->ctx_len;
+	}
+	return len;
+}
+
+static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
+{
+	memcpy(&x->id, &p->id, sizeof(x->id));
+	memcpy(&x->sel, &p->sel, sizeof(x->sel));
+	memcpy(&x->lft, &p->lft, sizeof(x->lft));
+	x->props.mode = p->mode;
+	x->props.replay_window = min_t(unsigned int, p->replay_window,
+					sizeof(x->replay.bitmap) * 8);
+	x->props.reqid = p->reqid;
+	x->props.family = p->family;
+	memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
+	x->props.flags = p->flags;
+
+	if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
+		x->sel.family = p->family;
+}
+
+/*
+ * someday when pfkey also has support, we could have the code
+ * somehow made shareable and move it to xfrm_state.c - JHS
+ *
+*/
+static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
+				  int update_esn)
+{
+	struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
+	struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
+	struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
+	struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
+	struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
+
+	if (re) {
+		struct xfrm_replay_state_esn *replay_esn;
+		replay_esn = nla_data(re);
+		memcpy(x->replay_esn, replay_esn,
+		       xfrm_replay_state_esn_len(replay_esn));
+		memcpy(x->preplay_esn, replay_esn,
+		       xfrm_replay_state_esn_len(replay_esn));
+	}
+
+	if (rp) {
+		struct xfrm_replay_state *replay;
+		replay = nla_data(rp);
+		memcpy(&x->replay, replay, sizeof(*replay));
+		memcpy(&x->preplay, replay, sizeof(*replay));
+	}
+
+	if (lt) {
+		struct xfrm_lifetime_cur *ltime;
+		ltime = nla_data(lt);
+		x->curlft.bytes = ltime->bytes;
+		x->curlft.packets = ltime->packets;
+		x->curlft.add_time = ltime->add_time;
+		x->curlft.use_time = ltime->use_time;
+	}
+
+	if (et)
+		x->replay_maxage = nla_get_u32(et);
+
+	if (rt)
+		x->replay_maxdiff = nla_get_u32(rt);
+}
+
+static struct xfrm_state *xfrm_state_construct(struct net *net,
+					       struct xfrm_usersa_info *p,
+					       struct nlattr **attrs,
+					       int *errp)
+{
+	struct xfrm_state *x = xfrm_state_alloc(net);
+	int err = -ENOMEM;
+
+	if (!x)
+		goto error_no_put;
+
+	copy_from_user_state(x, p);
+
+	if (attrs[XFRMA_SA_EXTRA_FLAGS])
+		x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
+
+	if ((err = attach_aead(&x->aead, &x->props.ealgo,
+			       attrs[XFRMA_ALG_AEAD])))
+		goto error;
+	if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
+				     attrs[XFRMA_ALG_AUTH_TRUNC])))
+		goto error;
+	if (!x->props.aalgo) {
+		if ((err = attach_auth(&x->aalg, &x->props.aalgo,
+				       attrs[XFRMA_ALG_AUTH])))
+			goto error;
+	}
+	if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
+				   xfrm_ealg_get_byname,
+				   attrs[XFRMA_ALG_CRYPT])))
+		goto error;
+	if ((err = attach_one_algo(&x->calg, &x->props.calgo,
+				   xfrm_calg_get_byname,
+				   attrs[XFRMA_ALG_COMP])))
+		goto error;
+
+	if (attrs[XFRMA_ENCAP]) {
+		x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
+				   sizeof(*x->encap), GFP_KERNEL);
+		if (x->encap == NULL)
+			goto error;
+	}
+
+	if (attrs[XFRMA_TFCPAD])
+		x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
+
+	if (attrs[XFRMA_COADDR]) {
+		x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
+				    sizeof(*x->coaddr), GFP_KERNEL);
+		if (x->coaddr == NULL)
+			goto error;
+	}
+
+	xfrm_mark_get(attrs, &x->mark);
+
+	err = __xfrm_init_state(x, false);
+	if (err)
+		goto error;
+
+	if (attrs[XFRMA_SEC_CTX] &&
+	    security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
+		goto error;
+
+	if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
+					       attrs[XFRMA_REPLAY_ESN_VAL])))
+		goto error;
+
+	x->km.seq = p->seq;
+	x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
+	/* sysctl_xfrm_aevent_etime is in 100ms units */
+	x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
+
+	if ((err = xfrm_init_replay(x)))
+		goto error;
+
+	/* override default values from above */
+	xfrm_update_ae_params(x, attrs, 0);
+
+	return x;
+
+error:
+	x->km.state = XFRM_STATE_DEAD;
+	xfrm_state_put(x);
+error_no_put:
+	*errp = err;
+	return NULL;
+}
+
+static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
+		struct nlattr **attrs)
+{
+	struct net *net = sock_net(skb->sk);
+	struct xfrm_usersa_info *p = nlmsg_data(nlh);
+	struct xfrm_state *x;
+	int err;
+	struct km_event c;
+
+	err = verify_newsa_info(p, attrs);
+	if (err)
+		return err;
+
+	x = xfrm_state_construct(net, p, attrs, &err);
+	if (!x)
+		return err;
+
+	xfrm_state_hold(x);
+	if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
+		err = xfrm_state_add(x);
+	else
+		err = xfrm_state_update(x);
+
+	xfrm_audit_state_add(x, err ? 0 : 1, true);
+
+	if (err < 0) {
+		x->km.state = XFRM_STATE_DEAD;
+		__xfrm_state_put(x);
+		goto out;
+	}
+
+	c.seq = nlh->nlmsg_seq;
+	c.portid = nlh->nlmsg_pid;
+	c.event = nlh->nlmsg_type;
+
+	km_state_notify(x, &c);
+out:
+	xfrm_state_put(x);
+	return err;
+}
+
+static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
+						 struct xfrm_usersa_id *p,
+						 struct nlattr **attrs,
+						 int *errp)
+{
+	struct xfrm_state *x = NULL;
+	struct xfrm_mark m;
+	int err;
+	u32 mark = xfrm_mark_get(attrs, &m);
+
+	if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
+		err = -ESRCH;
+		x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
+	} else {
+		xfrm_address_t *saddr = NULL;
+
+		verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
+		if (!saddr) {
+			err = -EINVAL;
+			goto out;
+		}
+
+		err = -ESRCH;
+		x = xfrm_state_lookup_byaddr(net, mark,
+					     &p->daddr, saddr,
+					     p->proto, p->family);
+	}
+
+ out:
+	if (!x && errp)
+		*errp = err;
+	return x;
+}
+
+static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
+		struct nlattr **attrs)
+{
+	struct net *net = sock_net(skb->sk);
+	struct xfrm_state *x;
+	int err = -ESRCH;
+	struct km_event c;
+	struct xfrm_usersa_id *p = nlmsg_data(nlh);
+
+	x = xfrm_user_state_lookup(net, p, attrs, &err);
+	if (x == NULL)
+		return err;
+
+	if ((err = security_xfrm_state_delete(x)) != 0)
+		goto out;
+
+	if (xfrm_state_kern(x)) {
+		err = -EPERM;
+		goto out;
+	}
+
+	err = xfrm_state_delete(x);
+
+	if (err < 0)
+		goto out;
+
+	c.seq = nlh->nlmsg_seq;
+	c.portid = nlh->nlmsg_pid;
+	c.event = nlh->nlmsg_type;
+	km_state_notify(x, &c);
+
+out:
+	xfrm_audit_state_delete(x, err ? 0 : 1, true);
+	xfrm_state_put(x);
+	return err;
+}
+
+static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
+{
+	memset(p, 0, sizeof(*p));
+	memcpy(&p->id, &x->id, sizeof(p->id));
+	memcpy(&p->sel, &x->sel, sizeof(p->sel));
+	memcpy(&p->lft, &x->lft, sizeof(p->lft));
+	memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
+	memcpy(&p->stats, &x->stats, sizeof(p->stats));
+	memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
+	p->mode = x->props.mode;
+	p->replay_window = x->props.replay_window;
+	p->reqid = x->props.reqid;
+	p->family = x->props.family;
+	p->flags = x->props.flags;
+	p->seq = x->km.seq;
+}
+
+struct xfrm_dump_info {
+	struct sk_buff *in_skb;
+	struct sk_buff *out_skb;
+	u32 nlmsg_seq;
+	u16 nlmsg_flags;
+};
+
+static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
+{
+	struct xfrm_user_sec_ctx *uctx;
+	struct nlattr *attr;
+	int ctx_size = sizeof(*uctx) + s->ctx_len;
+
+	attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
+	if (attr == NULL)
+		return -EMSGSIZE;
+
+	uctx = nla_data(attr);
+	uctx->exttype = XFRMA_SEC_CTX;
+	uctx->len = ctx_size;
+	uctx->ctx_doi = s->ctx_doi;
+	uctx->ctx_alg = s->ctx_alg;
+	uctx->ctx_len = s->ctx_len;
+	memcpy(uctx + 1, s->ctx_str, s->ctx_len);
+
+	return 0;
+}
+
+static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
+{
+	struct xfrm_algo *algo;
+	struct nlattr *nla;
+
+	nla = nla_reserve(skb, XFRMA_ALG_AUTH,
+			  sizeof(*algo) + (auth->alg_key_len + 7) / 8);
+	if (!nla)
+		return -EMSGSIZE;
+
+	algo = nla_data(nla);
+	strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
+	memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
+	algo->alg_key_len = auth->alg_key_len;
+
+	return 0;
+}
+
+/* Don't change this without updating xfrm_sa_len! */
+static int copy_to_user_state_extra(struct xfrm_state *x,
+				    struct xfrm_usersa_info *p,
+				    struct sk_buff *skb)
+{
+	int ret = 0;
+
+	copy_to_user_state(x, p);
+
+	if (x->props.extra_flags) {
+		ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
+				  x->props.extra_flags);
+		if (ret)
+			goto out;
+	}
+
+	if (x->coaddr) {
+		ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
+		if (ret)
+			goto out;
+	}
+	if (x->lastused) {
+		ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused);
+		if (ret)
+			goto out;
+	}
+	if (x->aead) {
+		ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
+		if (ret)
+			goto out;
+	}
+	if (x->aalg) {
+		ret = copy_to_user_auth(x->aalg, skb);
+		if (!ret)
+			ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
+				      xfrm_alg_auth_len(x->aalg), x->aalg);
+		if (ret)
+			goto out;
+	}
+	if (x->ealg) {
+		ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
+		if (ret)
+			goto out;
+	}
+	if (x->calg) {
+		ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
+		if (ret)
+			goto out;
+	}
+	if (x->encap) {
+		ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
+		if (ret)
+			goto out;
+	}
+	if (x->tfcpad) {
+		ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
+		if (ret)
+			goto out;
+	}
+	ret = xfrm_mark_put(skb, &x->mark);
+	if (ret)
+		goto out;
+	if (x->replay_esn)
+		ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
+			      xfrm_replay_state_esn_len(x->replay_esn),
+			      x->replay_esn);
+	else
+		ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
+			      &x->replay);
+	if (ret)
+		goto out;
+	if (x->security)
+		ret = copy_sec_ctx(x->security, skb);
+out:
+	return ret;
+}
+
+static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
+{
+	struct xfrm_dump_info *sp = ptr;
+	struct sk_buff *in_skb = sp->in_skb;
+	struct sk_buff *skb = sp->out_skb;
+	struct xfrm_usersa_info *p;
+	struct nlmsghdr *nlh;
+	int err;
+
+	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
+			XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
+	if (nlh == NULL)
+		return -EMSGSIZE;
+
+	p = nlmsg_data(nlh);
+
+	err = copy_to_user_state_extra(x, p, skb);
+	if (err) {
+		nlmsg_cancel(skb, nlh);
+		return err;
+	}
+	nlmsg_end(skb, nlh);
+	return 0;
+}
+
+static int xfrm_dump_sa_done(struct netlink_callback *cb)
+{
+	struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
+	struct sock *sk = cb->skb->sk;
+	struct net *net = sock_net(sk);
+
+	xfrm_state_walk_done(walk, net);
+	return 0;
+}
+
+static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
+static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	struct net *net = sock_net(skb->sk);
+	struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
+	struct xfrm_dump_info info;
+
+	BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
+		     sizeof(cb->args) - sizeof(cb->args[0]));
+
+	info.in_skb = cb->skb;
+	info.out_skb = skb;
+	info.nlmsg_seq = cb->nlh->nlmsg_seq;
+	info.nlmsg_flags = NLM_F_MULTI;
+
+	if (!cb->args[0]) {
+		struct nlattr *attrs[XFRMA_MAX+1];
+		struct xfrm_address_filter *filter = NULL;
+		u8 proto = 0;
+		int err;
+
+		cb->args[0] = 1;
+
+		err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX,
+				  xfrma_policy);
+		if (err < 0)
+			return err;
+
+		if (attrs[XFRMA_ADDRESS_FILTER]) {
+			filter = kmalloc(sizeof(*filter), GFP_KERNEL);
+			if (filter == NULL)
+				return -ENOMEM;
+
+			memcpy(filter, nla_data(attrs[XFRMA_ADDRESS_FILTER]),
+			       sizeof(*filter));
+		}
+
+		if (attrs[XFRMA_PROTO])
+			proto = nla_get_u8(attrs[XFRMA_PROTO]);
+
+		xfrm_state_walk_init(walk, proto, filter);
+	}
+
+	(void) xfrm_state_walk(net, walk, dump_one_state, &info);
+
+	return skb->len;
+}
+
+static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
+					  struct xfrm_state *x, u32 seq)
+{
+	struct xfrm_dump_info info;
+	struct sk_buff *skb;
+	int err;
+
+	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
+	if (!skb)
+		return ERR_PTR(-ENOMEM);
+
+	info.in_skb = in_skb;
+	info.out_skb = skb;
+	info.nlmsg_seq = seq;
+	info.nlmsg_flags = 0;
+
+	err = dump_one_state(x, 0, &info);
+	if (err) {
+		kfree_skb(skb);
+		return ERR_PTR(err);
+	}
+
+	return skb;
+}
+
+/* A wrapper for nlmsg_multicast() checking that nlsk is still available.
+ * Must be called with RCU read lock.
+ */
+static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
+				       u32 pid, unsigned int group)
+{
+	struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
+
+	if (nlsk)
+		return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
+	else
+		return -1;
+}
+
+static inline size_t xfrm_spdinfo_msgsize(void)
+{
+	return NLMSG_ALIGN(4)
+	       + nla_total_size(sizeof(struct xfrmu_spdinfo))
+	       + nla_total_size(sizeof(struct xfrmu_spdhinfo))
+	       + nla_total_size(sizeof(struct xfrmu_spdhthresh))
+	       + nla_total_size(sizeof(struct xfrmu_spdhthresh));
+}
+
+static int build_spdinfo(struct sk_buff *skb, struct net *net,
+			 u32 portid, u32 seq, u32 flags)
+{
+	struct xfrmk_spdinfo si;
+	struct xfrmu_spdinfo spc;
+	struct xfrmu_spdhinfo sph;
+	struct xfrmu_spdhthresh spt4, spt6;
+	struct nlmsghdr *nlh;
+	int err;
+	u32 *f;
+	unsigned lseq;
+
+	nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
+	if (nlh == NULL) /* shouldn't really happen ... */
+		return -EMSGSIZE;
+
+	f = nlmsg_data(nlh);
+	*f = flags;
+	xfrm_spd_getinfo(net, &si);
+	spc.incnt = si.incnt;
+	spc.outcnt = si.outcnt;
+	spc.fwdcnt = si.fwdcnt;
+	spc.inscnt = si.inscnt;
+	spc.outscnt = si.outscnt;
+	spc.fwdscnt = si.fwdscnt;
+	sph.spdhcnt = si.spdhcnt;
+	sph.spdhmcnt = si.spdhmcnt;
+
+	do {
+		lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
+
+		spt4.lbits = net->xfrm.policy_hthresh.lbits4;
+		spt4.rbits = net->xfrm.policy_hthresh.rbits4;
+		spt6.lbits = net->xfrm.policy_hthresh.lbits6;
+		spt6.rbits = net->xfrm.policy_hthresh.rbits6;
+	} while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
+
+	err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
+	if (!err)
+		err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
+	if (!err)
+		err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
+	if (!err)
+		err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
+	if (err) {
+		nlmsg_cancel(skb, nlh);
+		return err;
+	}
+
+	nlmsg_end(skb, nlh);
+	return 0;
+}
+
+static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
+			    struct nlattr **attrs)
+{
+	struct net *net = sock_net(skb->sk);
+	struct xfrmu_spdhthresh *thresh4 = NULL;
+	struct xfrmu_spdhthresh *thresh6 = NULL;
+
+	/* selector prefixlen thresholds to hash policies */
+	if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
+		struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
+
+		if (nla_len(rta) < sizeof(*thresh4))
+			return -EINVAL;
+		thresh4 = nla_data(rta);
+		if (thresh4->lbits > 32 || thresh4->rbits > 32)
+			return -EINVAL;
+	}
+	if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
+		struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
+
+		if (nla_len(rta) < sizeof(*thresh6))
+			return -EINVAL;
+		thresh6 = nla_data(rta);
+		if (thresh6->lbits > 128 || thresh6->rbits > 128)
+			return -EINVAL;
+	}
+
+	if (thresh4 || thresh6) {
+		write_seqlock(&net->xfrm.policy_hthresh.lock);
+		if (thresh4) {
+			net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
+			net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
+		}
+		if (thresh6) {
+			net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
+			net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
+		}
+		write_sequnlock(&net->xfrm.policy_hthresh.lock);
+
+		xfrm_policy_hash_rebuild(net);
+	}
+
+	return 0;
+}
+
+static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
+		struct nlattr **attrs)
+{
+	struct net *net = sock_net(skb->sk);
+	struct sk_buff *r_skb;
+	u32 *flags = nlmsg_data(nlh);
+	u32 sportid = NETLINK_CB(skb).portid;
+	u32 seq = nlh->nlmsg_seq;
+
+	r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
+	if (r_skb == NULL)
+		return -ENOMEM;
+
+	if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
+		BUG();
+
+	return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
+}
+
+static inline size_t xfrm_sadinfo_msgsize(void)
+{
+	return NLMSG_ALIGN(4)
+	       + nla_total_size(sizeof(struct xfrmu_sadhinfo))
+	       + nla_total_size(4); /* XFRMA_SAD_CNT */
+}
+
+static int build_sadinfo(struct sk_buff *skb, struct net *net,
+			 u32 portid, u32 seq, u32 flags)
+{
+	struct xfrmk_sadinfo si;
+	struct xfrmu_sadhinfo sh;
+	struct nlmsghdr *nlh;
+	int err;
+	u32 *f;
+
+	nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
+	if (nlh == NULL) /* shouldn't really happen ... */
+		return -EMSGSIZE;
+
+	f = nlmsg_data(nlh);
+	*f = flags;
+	xfrm_sad_getinfo(net, &si);
+
+	sh.sadhmcnt = si.sadhmcnt;
+	sh.sadhcnt = si.sadhcnt;
+
+	err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
+	if (!err)
+		err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
+	if (err) {
+		nlmsg_cancel(skb, nlh);
+		return err;
+	}
+
+	nlmsg_end(skb, nlh);
+	return 0;
+}
+
+static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
+		struct nlattr **attrs)
+{
+	struct net *net = sock_net(skb->sk);
+	struct sk_buff *r_skb;
+	u32 *flags = nlmsg_data(nlh);
+	u32 sportid = NETLINK_CB(skb).portid;
+	u32 seq = nlh->nlmsg_seq;
+
+	r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
+	if (r_skb == NULL)
+		return -ENOMEM;
+
+	if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
+		BUG();
+
+	return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
+}
+
+static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
+		struct nlattr **attrs)
+{
+	struct net *net = sock_net(skb->sk);
+	struct xfrm_usersa_id *p = nlmsg_data(nlh);
+	struct xfrm_state *x;
+	struct sk_buff *resp_skb;
+	int err = -ESRCH;
+
+	x = xfrm_user_state_lookup(net, p, attrs, &err);
+	if (x == NULL)
+		goto out_noput;
+
+	resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
+	if (IS_ERR(resp_skb)) {
+		err = PTR_ERR(resp_skb);
+	} else {
+		err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
+	}
+	xfrm_state_put(x);
+out_noput:
+	return err;
+}
+
+static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
+		struct nlattr **attrs)
+{
+	struct net *net = sock_net(skb->sk);
+	struct xfrm_state *x;
+	struct xfrm_userspi_info *p;
+	struct sk_buff *resp_skb;
+	xfrm_address_t *daddr;
+	int family;
+	int err;
+	u32 mark;
+	struct xfrm_mark m;
+
+	p = nlmsg_data(nlh);
+	err = verify_spi_info(p->info.id.proto, p->min, p->max);
+	if (err)
+		goto out_noput;
+
+	family = p->info.family;
+	daddr = &p->info.id.daddr;
+
+	x = NULL;
+
+	mark = xfrm_mark_get(attrs, &m);
+	if (p->info.seq) {
+		x = xfrm_find_acq_byseq(net, mark, p->info.seq);
+		if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
+			xfrm_state_put(x);
+			x = NULL;
+		}
+	}
+
+	if (!x)
+		x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
+				  p->info.id.proto, daddr,
+				  &p->info.saddr, 1,
+				  family);
+	err = -ENOENT;
+	if (x == NULL)
+		goto out_noput;
+
+	err = xfrm_alloc_spi(x, p->min, p->max);
+	if (err)
+		goto out;
+
+	resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
+	if (IS_ERR(resp_skb)) {
+		err = PTR_ERR(resp_skb);
+		goto out;
+	}
+
+	err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
+
+out:
+	xfrm_state_put(x);
+out_noput:
+	return err;
+}
+
+static int verify_policy_dir(u8 dir)
+{
+	switch (dir) {
+	case XFRM_POLICY_IN:
+	case XFRM_POLICY_OUT:
+	case XFRM_POLICY_FWD:
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int verify_policy_type(u8 type)
+{
+	switch (type) {
+	case XFRM_POLICY_TYPE_MAIN:
+#ifdef CONFIG_XFRM_SUB_POLICY
+	case XFRM_POLICY_TYPE_SUB:
+#endif
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
+{
+	int ret;
+
+	switch (p->share) {
+	case XFRM_SHARE_ANY:
+	case XFRM_SHARE_SESSION:
+	case XFRM_SHARE_USER:
+	case XFRM_SHARE_UNIQUE:
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	switch (p->action) {
+	case XFRM_POLICY_ALLOW:
+	case XFRM_POLICY_BLOCK:
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	switch (p->sel.family) {
+	case AF_INET:
+		break;
+
+	case AF_INET6:
+#if IS_ENABLED(CONFIG_IPV6)
+		break;
+#else
+		return  -EAFNOSUPPORT;
+#endif
+
+	default:
+		return -EINVAL;
+	}
+
+	ret = verify_policy_dir(p->dir);
+	if (ret)
+		return ret;
+	if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
+		return -EINVAL;
+
+	return 0;
+}
+
+static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
+{
+	struct nlattr *rt = attrs[XFRMA_SEC_CTX];
+	struct xfrm_user_sec_ctx *uctx;
+
+	if (!rt)
+		return 0;
+
+	uctx = nla_data(rt);
+	return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
+}
+
+static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
+			   int nr)
+{
+	int i;
+
+	xp->xfrm_nr = nr;
+	for (i = 0; i < nr; i++, ut++) {
+		struct xfrm_tmpl *t = &xp->xfrm_vec[i];
+
+		memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
+		memcpy(&t->saddr, &ut->saddr,
+		       sizeof(xfrm_address_t));
+		t->reqid = ut->reqid;
+		t->mode = ut->mode;
+		t->share = ut->share;
+		t->optional = ut->optional;
+		t->aalgos = ut->aalgos;
+		t->ealgos = ut->ealgos;
+		t->calgos = ut->calgos;
+		/* If all masks are ~0, then we allow all algorithms. */
+		t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
+		t->encap_family = ut->family;
+	}
+}
+
+static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
+{
+	int i;
+
+	if (nr > XFRM_MAX_DEPTH)
+		return -EINVAL;
+
+	for (i = 0; i < nr; i++) {
+		/* We never validated the ut->family value, so many
+		 * applications simply leave it at zero.  The check was
+		 * never made and ut->family was ignored because all
+		 * templates could be assumed to have the same family as
+		 * the policy itself.  Now that we will have ipv4-in-ipv6
+		 * and ipv6-in-ipv4 tunnels, this is no longer true.
+		 */
+		if (!ut[i].family)
+			ut[i].family = family;
+
+		switch (ut[i].family) {
+		case AF_INET:
+			break;
+#if IS_ENABLED(CONFIG_IPV6)
+		case AF_INET6:
+			break;
+#endif
+		default:
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
+{
+	struct nlattr *rt = attrs[XFRMA_TMPL];
+
+	if (!rt) {
+		pol->xfrm_nr = 0;
+	} else {
+		struct xfrm_user_tmpl *utmpl = nla_data(rt);
+		int nr = nla_len(rt) / sizeof(*utmpl);
+		int err;
+
+		err = validate_tmpl(nr, utmpl, pol->family);
+		if (err)
+			return err;
+
+		copy_templates(pol, utmpl, nr);
+	}
+	return 0;
+}
+
+static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
+{
+	struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
+	struct xfrm_userpolicy_type *upt;
+	u8 type = XFRM_POLICY_TYPE_MAIN;
+	int err;
+
+	if (rt) {
+		upt = nla_data(rt);
+		type = upt->type;
+	}
+
+	err = verify_policy_type(type);
+	if (err)
+		return err;
+
+	*tp = type;
+	return 0;
+}
+
+static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
+{
+	xp->priority = p->priority;
+	xp->index = p->index;
+	memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
+	memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
+	xp->action = p->action;
+	xp->flags = p->flags;
+	xp->family = p->sel.family;
+	/* XXX xp->share = p->share; */
+}
+
+static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
+{
+	memset(p, 0, sizeof(*p));
+	memcpy(&p->sel, &xp->selector, sizeof(p->sel));
+	memcpy(&p->lft, &xp->lft, sizeof(p->lft));
+	memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
+	p->priority = xp->priority;
+	p->index = xp->index;
+	p->sel.family = xp->family;
+	p->dir = dir;
+	p->action = xp->action;
+	p->flags = xp->flags;
+	p->share = XFRM_SHARE_ANY; /* XXX xp->share */
+}
+
+static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
+{
+	struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
+	int err;
+
+	if (!xp) {
+		*errp = -ENOMEM;
+		return NULL;
+	}
+
+	copy_from_user_policy(xp, p);
+
+	err = copy_from_user_policy_type(&xp->type, attrs);
+	if (err)
+		goto error;
+
+	if (!(err = copy_from_user_tmpl(xp, attrs)))
+		err = copy_from_user_sec_ctx(xp, attrs);
+	if (err)
+		goto error;
+
+	xfrm_mark_get(attrs, &xp->mark);
+
+	return xp;
+ error:
+	*errp = err;
+	xp->walk.dead = 1;
+	xfrm_policy_destroy(xp);
+	return NULL;
+}
+
+static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
+		struct nlattr **attrs)
+{
+	struct net *net = sock_net(skb->sk);
+	struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
+	struct xfrm_policy *xp;
+	struct km_event c;
+	int err;
+	int excl;
+
+	err = verify_newpolicy_info(p);
+	if (err)
+		return err;
+	err = verify_sec_ctx_len(attrs);
+	if (err)
+		return err;
+
+	xp = xfrm_policy_construct(net, p, attrs, &err);
+	if (!xp)
+		return err;
+
+	/* shouldn't excl be based on nlh flags??
+	 * Aha! this is anti-netlink really i.e  more pfkey derived
+	 * in netlink excl is a flag and you wouldnt need
+	 * a type XFRM_MSG_UPDPOLICY - JHS */
+	excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
+	err = xfrm_policy_insert(p->dir, xp, excl);
+	xfrm_audit_policy_add(xp, err ? 0 : 1, true);
+
+	if (err) {
+		security_xfrm_policy_free(xp->security);
+		kfree(xp);
+		return err;
+	}
+
+	c.event = nlh->nlmsg_type;
+	c.seq = nlh->nlmsg_seq;
+	c.portid = nlh->nlmsg_pid;
+	km_policy_notify(xp, p->dir, &c);
+
+	xfrm_pol_put(xp);
+
+	return 0;
+}
+
+static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
+{
+	struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
+	int i;
+
+	if (xp->xfrm_nr == 0)
+		return 0;
+
+	for (i = 0; i < xp->xfrm_nr; i++) {
+		struct xfrm_user_tmpl *up = &vec[i];
+		struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
+
+		memset(up, 0, sizeof(*up));
+		memcpy(&up->id, &kp->id, sizeof(up->id));
+		up->family = kp->encap_family;
+		memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
+		up->reqid = kp->reqid;
+		up->mode = kp->mode;
+		up->share = kp->share;
+		up->optional = kp->optional;
+		up->aalgos = kp->aalgos;
+		up->ealgos = kp->ealgos;
+		up->calgos = kp->calgos;
+	}
+
+	return nla_put(skb, XFRMA_TMPL,
+		       sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
+}
+
+static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
+{
+	if (x->security) {
+		return copy_sec_ctx(x->security, skb);
+	}
+	return 0;
+}
+
+static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
+{
+	if (xp->security)
+		return copy_sec_ctx(xp->security, skb);
+	return 0;
+}
+static inline size_t userpolicy_type_attrsize(void)
+{
+#ifdef CONFIG_XFRM_SUB_POLICY
+	return nla_total_size(sizeof(struct xfrm_userpolicy_type));
+#else
+	return 0;
+#endif
+}
+
+#ifdef CONFIG_XFRM_SUB_POLICY
+static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
+{
+	struct xfrm_userpolicy_type upt = {
+		.type = type,
+	};
+
+	return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
+}
+
+#else
+static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
+{
+	return 0;
+}
+#endif
+
+static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
+{
+	struct xfrm_dump_info *sp = ptr;
+	struct xfrm_userpolicy_info *p;
+	struct sk_buff *in_skb = sp->in_skb;
+	struct sk_buff *skb = sp->out_skb;
+	struct nlmsghdr *nlh;
+	int err;
+
+	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
+			XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
+	if (nlh == NULL)
+		return -EMSGSIZE;
+
+	p = nlmsg_data(nlh);
+	copy_to_user_policy(xp, p, dir);
+	err = copy_to_user_tmpl(xp, skb);
+	if (!err)
+		err = copy_to_user_sec_ctx(xp, skb);
+	if (!err)
+		err = copy_to_user_policy_type(xp->type, skb);
+	if (!err)
+		err = xfrm_mark_put(skb, &xp->mark);
+	if (err) {
+		nlmsg_cancel(skb, nlh);
+		return err;
+	}
+	nlmsg_end(skb, nlh);
+	return 0;
+}
+
+static int xfrm_dump_policy_done(struct netlink_callback *cb)
+{
+	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
+	struct net *net = sock_net(cb->skb->sk);
+
+	xfrm_policy_walk_done(walk, net);
+	return 0;
+}
+
+static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	struct net *net = sock_net(skb->sk);
+	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
+	struct xfrm_dump_info info;
+
+	BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
+		     sizeof(cb->args) - sizeof(cb->args[0]));
+
+	info.in_skb = cb->skb;
+	info.out_skb = skb;
+	info.nlmsg_seq = cb->nlh->nlmsg_seq;
+	info.nlmsg_flags = NLM_F_MULTI;
+
+	if (!cb->args[0]) {
+		cb->args[0] = 1;
+		xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
+	}
+
+	(void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
+
+	return skb->len;
+}
+
+static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
+					  struct xfrm_policy *xp,
+					  int dir, u32 seq)
+{
+	struct xfrm_dump_info info;
+	struct sk_buff *skb;
+	int err;
+
+	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+	if (!skb)
+		return ERR_PTR(-ENOMEM);
+
+	info.in_skb = in_skb;
+	info.out_skb = skb;
+	info.nlmsg_seq = seq;
+	info.nlmsg_flags = 0;
+
+	err = dump_one_policy(xp, dir, 0, &info);
+	if (err) {
+		kfree_skb(skb);
+		return ERR_PTR(err);
+	}
+
+	return skb;
+}
+
+static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
+		struct nlattr **attrs)
+{
+	struct net *net = sock_net(skb->sk);
+	struct xfrm_policy *xp;
+	struct xfrm_userpolicy_id *p;
+	u8 type = XFRM_POLICY_TYPE_MAIN;
+	int err;
+	struct km_event c;
+	int delete;
+	struct xfrm_mark m;
+	u32 mark = xfrm_mark_get(attrs, &m);
+
+	p = nlmsg_data(nlh);
+	delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
+
+	err = copy_from_user_policy_type(&type, attrs);
+	if (err)
+		return err;
+
+	err = verify_policy_dir(p->dir);
+	if (err)
+		return err;
+
+	if (p->index)
+		xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
+	else {
+		struct nlattr *rt = attrs[XFRMA_SEC_CTX];
+		struct xfrm_sec_ctx *ctx;
+
+		err = verify_sec_ctx_len(attrs);
+		if (err)
+			return err;
+
+		ctx = NULL;
+		if (rt) {
+			struct xfrm_user_sec_ctx *uctx = nla_data(rt);
+
+			err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
+			if (err)
+				return err;
+		}
+		xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
+					   ctx, delete, &err);
+		security_xfrm_policy_free(ctx);
+	}
+	if (xp == NULL)
+		return -ENOENT;
+
+	if (!delete) {
+		struct sk_buff *resp_skb;
+
+		resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
+		if (IS_ERR(resp_skb)) {
+			err = PTR_ERR(resp_skb);
+		} else {
+			err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
+					    NETLINK_CB(skb).portid);
+		}
+	} else {
+		xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
+
+		if (err != 0)
+			goto out;
+
+		c.data.byid = p->index;
+		c.event = nlh->nlmsg_type;
+		c.seq = nlh->nlmsg_seq;
+		c.portid = nlh->nlmsg_pid;
+		km_policy_notify(xp, p->dir, &c);
+	}
+
+out:
+	xfrm_pol_put(xp);
+	if (delete && err == 0)
+		xfrm_garbage_collect(net);
+	return err;
+}
+
+static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
+		struct nlattr **attrs)
+{
+	struct net *net = sock_net(skb->sk);
+	struct km_event c;
+	struct xfrm_usersa_flush *p = nlmsg_data(nlh);
+	int err;
+
+	err = xfrm_state_flush(net, p->proto, true);
+	if (err) {
+		if (err == -ESRCH) /* empty table */
+			return 0;
+		return err;
+	}
+	c.data.proto = p->proto;
+	c.event = nlh->nlmsg_type;
+	c.seq = nlh->nlmsg_seq;
+	c.portid = nlh->nlmsg_pid;
+	c.net = net;
+	km_state_notify(NULL, &c);
+
+	return 0;
+}
+
+static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
+{
+	size_t replay_size = x->replay_esn ?
+			      xfrm_replay_state_esn_len(x->replay_esn) :
+			      sizeof(struct xfrm_replay_state);
+
+	return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
+	       + nla_total_size(replay_size)
+	       + nla_total_size(sizeof(struct xfrm_lifetime_cur))
+	       + nla_total_size(sizeof(struct xfrm_mark))
+	       + nla_total_size(4) /* XFRM_AE_RTHR */
+	       + nla_total_size(4); /* XFRM_AE_ETHR */
+}
+
+static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
+{
+	struct xfrm_aevent_id *id;
+	struct nlmsghdr *nlh;
+	int err;
+
+	nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
+	if (nlh == NULL)
+		return -EMSGSIZE;
+
+	id = nlmsg_data(nlh);
+	memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
+	id->sa_id.spi = x->id.spi;
+	id->sa_id.family = x->props.family;
+	id->sa_id.proto = x->id.proto;
+	memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
+	id->reqid = x->props.reqid;
+	id->flags = c->data.aevent;
+
+	if (x->replay_esn) {
+		err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
+			      xfrm_replay_state_esn_len(x->replay_esn),
+			      x->replay_esn);
+	} else {
+		err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
+			      &x->replay);
+	}
+	if (err)
+		goto out_cancel;
+	err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
+	if (err)
+		goto out_cancel;
+
+	if (id->flags & XFRM_AE_RTHR) {
+		err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
+		if (err)
+			goto out_cancel;
+	}
+	if (id->flags & XFRM_AE_ETHR) {
+		err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
+				  x->replay_maxage * 10 / HZ);
+		if (err)
+			goto out_cancel;
+	}
+	err = xfrm_mark_put(skb, &x->mark);
+	if (err)
+		goto out_cancel;
+
+	nlmsg_end(skb, nlh);
+	return 0;
+
+out_cancel:
+	nlmsg_cancel(skb, nlh);
+	return err;
+}
+
+static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
+		struct nlattr **attrs)
+{
+	struct net *net = sock_net(skb->sk);
+	struct xfrm_state *x;
+	struct sk_buff *r_skb;
+	int err;
+	struct km_event c;
+	u32 mark;
+	struct xfrm_mark m;
+	struct xfrm_aevent_id *p = nlmsg_data(nlh);
+	struct xfrm_usersa_id *id = &p->sa_id;
+
+	mark = xfrm_mark_get(attrs, &m);
+
+	x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
+	if (x == NULL)
+		return -ESRCH;
+
+	r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
+	if (r_skb == NULL) {
+		xfrm_state_put(x);
+		return -ENOMEM;
+	}
+
+	/*
+	 * XXX: is this lock really needed - none of the other
+	 * gets lock (the concern is things getting updated
+	 * while we are still reading) - jhs
+	*/
+	spin_lock_bh(&x->lock);
+	c.data.aevent = p->flags;
+	c.seq = nlh->nlmsg_seq;
+	c.portid = nlh->nlmsg_pid;
+
+	if (build_aevent(r_skb, x, &c) < 0)
+		BUG();
+	err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
+	spin_unlock_bh(&x->lock);
+	xfrm_state_put(x);
+	return err;
+}
+
+static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
+		struct nlattr **attrs)
+{
+	struct net *net = sock_net(skb->sk);
+	struct xfrm_state *x;
+	struct km_event c;
+	int err = -EINVAL;
+	u32 mark = 0;
+	struct xfrm_mark m;
+	struct xfrm_aevent_id *p = nlmsg_data(nlh);
+	struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
+	struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
+	struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
+
+	if (!lt && !rp && !re)
+		return err;
+
+	/* pedantic mode - thou shalt sayeth replaceth */
+	if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
+		return err;
+
+	mark = xfrm_mark_get(attrs, &m);
+
+	x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
+	if (x == NULL)
+		return -ESRCH;
+
+	if (x->km.state != XFRM_STATE_VALID)
+		goto out;
+
+	err = xfrm_replay_verify_len(x->replay_esn, re);
+	if (err)
+		goto out;
+
+	spin_lock_bh(&x->lock);
+	xfrm_update_ae_params(x, attrs, 1);
+	spin_unlock_bh(&x->lock);
+
+	c.event = nlh->nlmsg_type;
+	c.seq = nlh->nlmsg_seq;
+	c.portid = nlh->nlmsg_pid;
+	c.data.aevent = XFRM_AE_CU;
+	km_state_notify(x, &c);
+	err = 0;
+out:
+	xfrm_state_put(x);
+	return err;
+}
+
+static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
+		struct nlattr **attrs)
+{
+	struct net *net = sock_net(skb->sk);
+	struct km_event c;
+	u8 type = XFRM_POLICY_TYPE_MAIN;
+	int err;
+
+	err = copy_from_user_policy_type(&type, attrs);
+	if (err)
+		return err;
+
+	err = xfrm_policy_flush(net, type, true);
+	if (err) {
+		if (err == -ESRCH) /* empty table */
+			return 0;
+		return err;
+	}
+
+	c.data.type = type;
+	c.event = nlh->nlmsg_type;
+	c.seq = nlh->nlmsg_seq;
+	c.portid = nlh->nlmsg_pid;
+	c.net = net;
+	km_policy_notify(NULL, 0, &c);
+	return 0;
+}
+
+static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
+		struct nlattr **attrs)
+{
+	struct net *net = sock_net(skb->sk);
+	struct xfrm_policy *xp;
+	struct xfrm_user_polexpire *up = nlmsg_data(nlh);
+	struct xfrm_userpolicy_info *p = &up->pol;
+	u8 type = XFRM_POLICY_TYPE_MAIN;
+	int err = -ENOENT;
+	struct xfrm_mark m;
+	u32 mark = xfrm_mark_get(attrs, &m);
+
+	err = copy_from_user_policy_type(&type, attrs);
+	if (err)
+		return err;
+
+	err = verify_policy_dir(p->dir);
+	if (err)
+		return err;
+
+	if (p->index)
+		xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
+	else {
+		struct nlattr *rt = attrs[XFRMA_SEC_CTX];
+		struct xfrm_sec_ctx *ctx;
+
+		err = verify_sec_ctx_len(attrs);
+		if (err)
+			return err;
+
+		ctx = NULL;
+		if (rt) {
+			struct xfrm_user_sec_ctx *uctx = nla_data(rt);
+
+			err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
+			if (err)
+				return err;
+		}
+		xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
+					   &p->sel, ctx, 0, &err);
+		security_xfrm_policy_free(ctx);
+	}
+	if (xp == NULL)
+		return -ENOENT;
+
+	if (unlikely(xp->walk.dead))
+		goto out;
+
+	err = 0;
+	if (up->hard) {
+		xfrm_policy_delete(xp, p->dir);
+		xfrm_audit_policy_delete(xp, 1, true);
+	} else {
+		// reset the timers here?
+		WARN(1, "Dont know what to do with soft policy expire\n");
+	}
+	km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
+
+out:
+	xfrm_pol_put(xp);
+	return err;
+}
+
+static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
+		struct nlattr **attrs)
+{
+	struct net *net = sock_net(skb->sk);
+	struct xfrm_state *x;
+	int err;
+	struct xfrm_user_expire *ue = nlmsg_data(nlh);
+	struct xfrm_usersa_info *p = &ue->state;
+	struct xfrm_mark m;
+	u32 mark = xfrm_mark_get(attrs, &m);
+
+	x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
+
+	err = -ENOENT;
+	if (x == NULL)
+		return err;
+
+	spin_lock_bh(&x->lock);
+	err = -EINVAL;
+	if (x->km.state != XFRM_STATE_VALID)
+		goto out;
+	km_state_expired(x, ue->hard, nlh->nlmsg_pid);
+
+	if (ue->hard) {
+		__xfrm_state_delete(x);
+		xfrm_audit_state_delete(x, 1, true);
+	}
+	err = 0;
+out:
+	spin_unlock_bh(&x->lock);
+	xfrm_state_put(x);
+	return err;
+}
+
+static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
+		struct nlattr **attrs)
+{
+	struct net *net = sock_net(skb->sk);
+	struct xfrm_policy *xp;
+	struct xfrm_user_tmpl *ut;
+	int i;
+	struct nlattr *rt = attrs[XFRMA_TMPL];
+	struct xfrm_mark mark;
+
+	struct xfrm_user_acquire *ua = nlmsg_data(nlh);
+	struct xfrm_state *x = xfrm_state_alloc(net);
+	int err = -ENOMEM;
+
+	if (!x)
+		goto nomem;
+
+	xfrm_mark_get(attrs, &mark);
+
+	err = verify_newpolicy_info(&ua->policy);
+	if (err)
+		goto bad_policy;
+
+	/*   build an XP */
+	xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
+	if (!xp)
+		goto free_state;
+
+	memcpy(&x->id, &ua->id, sizeof(ua->id));
+	memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
+	memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
+	xp->mark.m = x->mark.m = mark.m;
+	xp->mark.v = x->mark.v = mark.v;
+	ut = nla_data(rt);
+	/* extract the templates and for each call km_key */
+	for (i = 0; i < xp->xfrm_nr; i++, ut++) {
+		struct xfrm_tmpl *t = &xp->xfrm_vec[i];
+		memcpy(&x->id, &t->id, sizeof(x->id));
+		x->props.mode = t->mode;
+		x->props.reqid = t->reqid;
+		x->props.family = ut->family;
+		t->aalgos = ua->aalgos;
+		t->ealgos = ua->ealgos;
+		t->calgos = ua->calgos;
+		err = km_query(x, t, xp);
+
+	}
+
+	kfree(x);
+	kfree(xp);
+
+	return 0;
+
+bad_policy:
+	WARN(1, "BAD policy passed\n");
+free_state:
+	kfree(x);
+nomem:
+	return err;
+}
+
+#ifdef CONFIG_XFRM_MIGRATE
+static int copy_from_user_migrate(struct xfrm_migrate *ma,
+				  struct xfrm_kmaddress *k,
+				  struct nlattr **attrs, int *num)
+{
+	struct nlattr *rt = attrs[XFRMA_MIGRATE];
+	struct xfrm_user_migrate *um;
+	int i, num_migrate;
+
+	if (k != NULL) {
+		struct xfrm_user_kmaddress *uk;
+
+		uk = nla_data(attrs[XFRMA_KMADDRESS]);
+		memcpy(&k->local, &uk->local, sizeof(k->local));
+		memcpy(&k->remote, &uk->remote, sizeof(k->remote));
+		k->family = uk->family;
+		k->reserved = uk->reserved;
+	}
+
+	um = nla_data(rt);
+	num_migrate = nla_len(rt) / sizeof(*um);
+
+	if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
+		return -EINVAL;
+
+	for (i = 0; i < num_migrate; i++, um++, ma++) {
+		memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
+		memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
+		memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
+		memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
+
+		ma->proto = um->proto;
+		ma->mode = um->mode;
+		ma->reqid = um->reqid;
+
+		ma->old_family = um->old_family;
+		ma->new_family = um->new_family;
+	}
+
+	*num = i;
+	return 0;
+}
+
+static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
+			   struct nlattr **attrs)
+{
+	struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
+	struct xfrm_migrate m[XFRM_MAX_DEPTH];
+	struct xfrm_kmaddress km, *kmp;
+	u8 type;
+	int err;
+	int n = 0;
+	struct net *net = sock_net(skb->sk);
+
+	if (attrs[XFRMA_MIGRATE] == NULL)
+		return -EINVAL;
+
+	kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
+
+	err = copy_from_user_policy_type(&type, attrs);
+	if (err)
+		return err;
+
+	err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
+	if (err)
+		return err;
+
+	if (!n)
+		return 0;
+
+	xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net);
+
+	return 0;
+}
+#else
+static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
+			   struct nlattr **attrs)
+{
+	return -ENOPROTOOPT;
+}
+#endif
+
+#ifdef CONFIG_XFRM_MIGRATE
+static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
+{
+	struct xfrm_user_migrate um;
+
+	memset(&um, 0, sizeof(um));
+	um.proto = m->proto;
+	um.mode = m->mode;
+	um.reqid = m->reqid;
+	um.old_family = m->old_family;
+	memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
+	memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
+	um.new_family = m->new_family;
+	memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
+	memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
+
+	return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
+}
+
+static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
+{
+	struct xfrm_user_kmaddress uk;
+
+	memset(&uk, 0, sizeof(uk));
+	uk.family = k->family;
+	uk.reserved = k->reserved;
+	memcpy(&uk.local, &k->local, sizeof(uk.local));
+	memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
+
+	return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
+}
+
+static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
+{
+	return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
+	      + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
+	      + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
+	      + userpolicy_type_attrsize();
+}
+
+static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
+			 int num_migrate, const struct xfrm_kmaddress *k,
+			 const struct xfrm_selector *sel, u8 dir, u8 type)
+{
+	const struct xfrm_migrate *mp;
+	struct xfrm_userpolicy_id *pol_id;
+	struct nlmsghdr *nlh;
+	int i, err;
+
+	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
+	if (nlh == NULL)
+		return -EMSGSIZE;
+
+	pol_id = nlmsg_data(nlh);
+	/* copy data from selector, dir, and type to the pol_id */
+	memset(pol_id, 0, sizeof(*pol_id));
+	memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
+	pol_id->dir = dir;
+
+	if (k != NULL) {
+		err = copy_to_user_kmaddress(k, skb);
+		if (err)
+			goto out_cancel;
+	}
+	err = copy_to_user_policy_type(type, skb);
+	if (err)
+		goto out_cancel;
+	for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
+		err = copy_to_user_migrate(mp, skb);
+		if (err)
+			goto out_cancel;
+	}
+
+	nlmsg_end(skb, nlh);
+	return 0;
+
+out_cancel:
+	nlmsg_cancel(skb, nlh);
+	return err;
+}
+
+static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
+			     const struct xfrm_migrate *m, int num_migrate,
+			     const struct xfrm_kmaddress *k)
+{
+	struct net *net = &init_net;
+	struct sk_buff *skb;
+
+	skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
+	if (skb == NULL)
+		return -ENOMEM;
+
+	/* build migrate */
+	if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
+		BUG();
+
+	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
+}
+#else
+static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
+			     const struct xfrm_migrate *m, int num_migrate,
+			     const struct xfrm_kmaddress *k)
+{
+	return -ENOPROTOOPT;
+}
+#endif
+
+#define XMSGSIZE(type) sizeof(struct type)
+
+static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
+	[XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
+	[XFRM_MSG_DELSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
+	[XFRM_MSG_GETSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
+	[XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
+	[XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
+	[XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
+	[XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
+	[XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
+	[XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
+	[XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
+	[XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
+	[XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
+	[XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
+	[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
+	[XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
+	[XFRM_MSG_GETAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
+	[XFRM_MSG_REPORT      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
+	[XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
+	[XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = sizeof(u32),
+	[XFRM_MSG_NEWSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
+	[XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
+};
+
+#undef XMSGSIZE
+
+static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
+	[XFRMA_SA]		= { .len = sizeof(struct xfrm_usersa_info)},
+	[XFRMA_POLICY]		= { .len = sizeof(struct xfrm_userpolicy_info)},
+	[XFRMA_LASTUSED]	= { .type = NLA_U64},
+	[XFRMA_ALG_AUTH_TRUNC]	= { .len = sizeof(struct xfrm_algo_auth)},
+	[XFRMA_ALG_AEAD]	= { .len = sizeof(struct xfrm_algo_aead) },
+	[XFRMA_ALG_AUTH]	= { .len = sizeof(struct xfrm_algo) },
+	[XFRMA_ALG_CRYPT]	= { .len = sizeof(struct xfrm_algo) },
+	[XFRMA_ALG_COMP]	= { .len = sizeof(struct xfrm_algo) },
+	[XFRMA_ENCAP]		= { .len = sizeof(struct xfrm_encap_tmpl) },
+	[XFRMA_TMPL]		= { .len = sizeof(struct xfrm_user_tmpl) },
+	[XFRMA_SEC_CTX]		= { .len = sizeof(struct xfrm_sec_ctx) },
+	[XFRMA_LTIME_VAL]	= { .len = sizeof(struct xfrm_lifetime_cur) },
+	[XFRMA_REPLAY_VAL]	= { .len = sizeof(struct xfrm_replay_state) },
+	[XFRMA_REPLAY_THRESH]	= { .type = NLA_U32 },
+	[XFRMA_ETIMER_THRESH]	= { .type = NLA_U32 },
+	[XFRMA_SRCADDR]		= { .len = sizeof(xfrm_address_t) },
+	[XFRMA_COADDR]		= { .len = sizeof(xfrm_address_t) },
+	[XFRMA_POLICY_TYPE]	= { .len = sizeof(struct xfrm_userpolicy_type)},
+	[XFRMA_MIGRATE]		= { .len = sizeof(struct xfrm_user_migrate) },
+	[XFRMA_KMADDRESS]	= { .len = sizeof(struct xfrm_user_kmaddress) },
+	[XFRMA_MARK]		= { .len = sizeof(struct xfrm_mark) },
+	[XFRMA_TFCPAD]		= { .type = NLA_U32 },
+	[XFRMA_REPLAY_ESN_VAL]	= { .len = sizeof(struct xfrm_replay_state_esn) },
+	[XFRMA_SA_EXTRA_FLAGS]	= { .type = NLA_U32 },
+	[XFRMA_PROTO]		= { .type = NLA_U8 },
+	[XFRMA_ADDRESS_FILTER]	= { .len = sizeof(struct xfrm_address_filter) },
+};
+
+static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
+	[XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
+	[XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
+};
+
+static const struct xfrm_link {
+	int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
+	int (*dump)(struct sk_buff *, struct netlink_callback *);
+	int (*done)(struct netlink_callback *);
+	const struct nla_policy *nla_pol;
+	int nla_max;
+} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
+	[XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
+	[XFRM_MSG_DELSA       - XFRM_MSG_BASE] = { .doit = xfrm_del_sa        },
+	[XFRM_MSG_GETSA       - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
+						   .dump = xfrm_dump_sa,
+						   .done = xfrm_dump_sa_done  },
+	[XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
+	[XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy    },
+	[XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
+						   .dump = xfrm_dump_policy,
+						   .done = xfrm_dump_policy_done },
+	[XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
+	[XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire   },
+	[XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
+	[XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
+	[XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
+	[XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
+	[XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa      },
+	[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy  },
+	[XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = { .doit = xfrm_new_ae  },
+	[XFRM_MSG_GETAE       - XFRM_MSG_BASE] = { .doit = xfrm_get_ae  },
+	[XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate    },
+	[XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo   },
+	[XFRM_MSG_NEWSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
+						   .nla_pol = xfrma_spd_policy,
+						   .nla_max = XFRMA_SPD_MAX },
+	[XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo   },
+};
+
+static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
+{
+	struct net *net = sock_net(skb->sk);
+	struct nlattr *attrs[XFRMA_MAX+1];
+	const struct xfrm_link *link;
+	int type, err;
+
+#ifdef CONFIG_COMPAT
+	if (is_compat_task())
+		return -ENOTSUPP;
+#endif
+
+	type = nlh->nlmsg_type;
+	if (type > XFRM_MSG_MAX)
+		return -EINVAL;
+
+	type -= XFRM_MSG_BASE;
+	link = &xfrm_dispatch[type];
+
+	/* All operations require privileges, even GET */
+	if (!netlink_net_capable(skb, CAP_NET_ADMIN))
+		return -EPERM;
+
+	if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
+	     type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
+	    (nlh->nlmsg_flags & NLM_F_DUMP)) {
+		if (link->dump == NULL)
+			return -EINVAL;
+
+		{
+			struct netlink_dump_control c = {
+				.dump = link->dump,
+				.done = link->done,
+			};
+			return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
+		}
+	}
+
+	err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs,
+			  link->nla_max ? : XFRMA_MAX,
+			  link->nla_pol ? : xfrma_policy);
+	if (err < 0)
+		return err;
+
+	if (link->doit == NULL)
+		return -EINVAL;
+
+	return link->doit(skb, nlh, attrs);
+}
+
+static void xfrm_netlink_rcv(struct sk_buff *skb)
+{
+	struct net *net = sock_net(skb->sk);
+
+	mutex_lock(&net->xfrm.xfrm_cfg_mutex);
+	netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
+	mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
+}
+
+static inline size_t xfrm_expire_msgsize(void)
+{
+	return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
+	       + nla_total_size(sizeof(struct xfrm_mark));
+}
+
+static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
+{
+	struct xfrm_user_expire *ue;
+	struct nlmsghdr *nlh;
+	int err;
+
+	nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
+	if (nlh == NULL)
+		return -EMSGSIZE;
+
+	ue = nlmsg_data(nlh);
+	copy_to_user_state(x, &ue->state);
+	ue->hard = (c->data.hard != 0) ? 1 : 0;
+
+	err = xfrm_mark_put(skb, &x->mark);
+	if (err)
+		return err;
+
+	nlmsg_end(skb, nlh);
+	return 0;
+}
+
+static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
+{
+	struct net *net = xs_net(x);
+	struct sk_buff *skb;
+
+	skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
+	if (skb == NULL)
+		return -ENOMEM;
+
+	if (build_expire(skb, x, c) < 0) {
+		kfree_skb(skb);
+		return -EMSGSIZE;
+	}
+
+	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
+}
+
+static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
+{
+	struct net *net = xs_net(x);
+	struct sk_buff *skb;
+
+	skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
+	if (skb == NULL)
+		return -ENOMEM;
+
+	if (build_aevent(skb, x, c) < 0)
+		BUG();
+
+	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
+}
+
+static int xfrm_notify_sa_flush(const struct km_event *c)
+{
+	struct net *net = c->net;
+	struct xfrm_usersa_flush *p;
+	struct nlmsghdr *nlh;
+	struct sk_buff *skb;
+	int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
+
+	skb = nlmsg_new(len, GFP_ATOMIC);
+	if (skb == NULL)
+		return -ENOMEM;
+
+	nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
+	if (nlh == NULL) {
+		kfree_skb(skb);
+		return -EMSGSIZE;
+	}
+
+	p = nlmsg_data(nlh);
+	p->proto = c->data.proto;
+
+	nlmsg_end(skb, nlh);
+
+	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
+}
+
+static inline size_t xfrm_sa_len(struct xfrm_state *x)
+{
+	size_t l = 0;
+	if (x->aead)
+		l += nla_total_size(aead_len(x->aead));
+	if (x->aalg) {
+		l += nla_total_size(sizeof(struct xfrm_algo) +
+				    (x->aalg->alg_key_len + 7) / 8);
+		l += nla_total_size(xfrm_alg_auth_len(x->aalg));
+	}
+	if (x->ealg)
+		l += nla_total_size(xfrm_alg_len(x->ealg));
+	if (x->calg)
+		l += nla_total_size(sizeof(*x->calg));
+	if (x->encap)
+		l += nla_total_size(sizeof(*x->encap));
+	if (x->tfcpad)
+		l += nla_total_size(sizeof(x->tfcpad));
+	if (x->replay_esn)
+		l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
+	else
+		l += nla_total_size(sizeof(struct xfrm_replay_state));
+	if (x->security)
+		l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
+				    x->security->ctx_len);
+	if (x->coaddr)
+		l += nla_total_size(sizeof(*x->coaddr));
+	if (x->props.extra_flags)
+		l += nla_total_size(sizeof(x->props.extra_flags));
+
+	/* Must count x->lastused as it may become non-zero behind our back. */
+	l += nla_total_size(sizeof(u64));
+
+	return l;
+}
+
+static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
+{
+	struct net *net = xs_net(x);
+	struct xfrm_usersa_info *p;
+	struct xfrm_usersa_id *id;
+	struct nlmsghdr *nlh;
+	struct sk_buff *skb;
+	int len = xfrm_sa_len(x);
+	int headlen, err;
+
+	headlen = sizeof(*p);
+	if (c->event == XFRM_MSG_DELSA) {
+		len += nla_total_size(headlen);
+		headlen = sizeof(*id);
+		len += nla_total_size(sizeof(struct xfrm_mark));
+	}
+	len += NLMSG_ALIGN(headlen);
+
+	skb = nlmsg_new(len, GFP_ATOMIC);
+	if (skb == NULL)
+		return -ENOMEM;
+
+	nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
+	err = -EMSGSIZE;
+	if (nlh == NULL)
+		goto out_free_skb;
+
+	p = nlmsg_data(nlh);
+	if (c->event == XFRM_MSG_DELSA) {
+		struct nlattr *attr;
+
+		id = nlmsg_data(nlh);
+		memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
+		id->spi = x->id.spi;
+		id->family = x->props.family;
+		id->proto = x->id.proto;
+
+		attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
+		err = -EMSGSIZE;
+		if (attr == NULL)
+			goto out_free_skb;
+
+		p = nla_data(attr);
+	}
+	err = copy_to_user_state_extra(x, p, skb);
+	if (err)
+		goto out_free_skb;
+
+	nlmsg_end(skb, nlh);
+
+	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
+
+out_free_skb:
+	kfree_skb(skb);
+	return err;
+}
+
+static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
+{
+
+	switch (c->event) {
+	case XFRM_MSG_EXPIRE:
+		return xfrm_exp_state_notify(x, c);
+	case XFRM_MSG_NEWAE:
+		return xfrm_aevent_state_notify(x, c);
+	case XFRM_MSG_DELSA:
+	case XFRM_MSG_UPDSA:
+	case XFRM_MSG_NEWSA:
+		return xfrm_notify_sa(x, c);
+	case XFRM_MSG_FLUSHSA:
+		return xfrm_notify_sa_flush(c);
+	default:
+		printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
+		       c->event);
+		break;
+	}
+
+	return 0;
+
+}
+
+static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
+					  struct xfrm_policy *xp)
+{
+	return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
+	       + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
+	       + nla_total_size(sizeof(struct xfrm_mark))
+	       + nla_total_size(xfrm_user_sec_ctx_size(x->security))
+	       + userpolicy_type_attrsize();
+}
+
+static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
+			 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
+{
+	__u32 seq = xfrm_get_acqseq();
+	struct xfrm_user_acquire *ua;
+	struct nlmsghdr *nlh;
+	int err;
+
+	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
+	if (nlh == NULL)
+		return -EMSGSIZE;
+
+	ua = nlmsg_data(nlh);
+	memcpy(&ua->id, &x->id, sizeof(ua->id));
+	memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
+	memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
+	copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
+	ua->aalgos = xt->aalgos;
+	ua->ealgos = xt->ealgos;
+	ua->calgos = xt->calgos;
+	ua->seq = x->km.seq = seq;
+
+	err = copy_to_user_tmpl(xp, skb);
+	if (!err)
+		err = copy_to_user_state_sec_ctx(x, skb);
+	if (!err)
+		err = copy_to_user_policy_type(xp->type, skb);
+	if (!err)
+		err = xfrm_mark_put(skb, &xp->mark);
+	if (err) {
+		nlmsg_cancel(skb, nlh);
+		return err;
+	}
+
+	nlmsg_end(skb, nlh);
+	return 0;
+}
+
+static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
+			     struct xfrm_policy *xp)
+{
+	struct net *net = xs_net(x);
+	struct sk_buff *skb;
+
+	skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
+	if (skb == NULL)
+		return -ENOMEM;
+
+	if (build_acquire(skb, x, xt, xp) < 0)
+		BUG();
+
+	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
+}
+
+/* User gives us xfrm_user_policy_info followed by an array of 0
+ * or more templates.
+ */
+static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
+					       u8 *data, int len, int *dir)
+{
+	struct net *net = sock_net(sk);
+	struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
+	struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
+	struct xfrm_policy *xp;
+	int nr;
+
+	switch (sk->sk_family) {
+	case AF_INET:
+		if (opt != IP_XFRM_POLICY) {
+			*dir = -EOPNOTSUPP;
+			return NULL;
+		}
+		break;
+#if IS_ENABLED(CONFIG_IPV6)
+	case AF_INET6:
+		if (opt != IPV6_XFRM_POLICY) {
+			*dir = -EOPNOTSUPP;
+			return NULL;
+		}
+		break;
+#endif
+	default:
+		*dir = -EINVAL;
+		return NULL;
+	}
+
+	*dir = -EINVAL;
+
+	if (len < sizeof(*p) ||
+	    verify_newpolicy_info(p))
+		return NULL;
+
+	nr = ((len - sizeof(*p)) / sizeof(*ut));
+	if (validate_tmpl(nr, ut, p->sel.family))
+		return NULL;
+
+	if (p->dir > XFRM_POLICY_OUT)
+		return NULL;
+
+	xp = xfrm_policy_alloc(net, GFP_ATOMIC);
+	if (xp == NULL) {
+		*dir = -ENOBUFS;
+		return NULL;
+	}
+
+	copy_from_user_policy(xp, p);
+	xp->type = XFRM_POLICY_TYPE_MAIN;
+	copy_templates(xp, ut, nr);
+
+	*dir = p->dir;
+
+	return xp;
+}
+
+static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
+{
+	return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
+	       + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
+	       + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
+	       + nla_total_size(sizeof(struct xfrm_mark))
+	       + userpolicy_type_attrsize();
+}
+
+static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
+			   int dir, const struct km_event *c)
+{
+	struct xfrm_user_polexpire *upe;
+	int hard = c->data.hard;
+	struct nlmsghdr *nlh;
+	int err;
+
+	nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
+	if (nlh == NULL)
+		return -EMSGSIZE;
+
+	upe = nlmsg_data(nlh);
+	copy_to_user_policy(xp, &upe->pol, dir);
+	err = copy_to_user_tmpl(xp, skb);
+	if (!err)
+		err = copy_to_user_sec_ctx(xp, skb);
+	if (!err)
+		err = copy_to_user_policy_type(xp->type, skb);
+	if (!err)
+		err = xfrm_mark_put(skb, &xp->mark);
+	if (err) {
+		nlmsg_cancel(skb, nlh);
+		return err;
+	}
+	upe->hard = !!hard;
+
+	nlmsg_end(skb, nlh);
+	return 0;
+}
+
+static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
+{
+	struct net *net = xp_net(xp);
+	struct sk_buff *skb;
+
+	skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
+	if (skb == NULL)
+		return -ENOMEM;
+
+	if (build_polexpire(skb, xp, dir, c) < 0)
+		BUG();
+
+	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
+}
+
+static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
+{
+	int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
+	struct net *net = xp_net(xp);
+	struct xfrm_userpolicy_info *p;
+	struct xfrm_userpolicy_id *id;
+	struct nlmsghdr *nlh;
+	struct sk_buff *skb;
+	int headlen, err;
+
+	headlen = sizeof(*p);
+	if (c->event == XFRM_MSG_DELPOLICY) {
+		len += nla_total_size(headlen);
+		headlen = sizeof(*id);
+	}
+	len += userpolicy_type_attrsize();
+	len += nla_total_size(sizeof(struct xfrm_mark));
+	len += NLMSG_ALIGN(headlen);
+
+	skb = nlmsg_new(len, GFP_ATOMIC);
+	if (skb == NULL)
+		return -ENOMEM;
+
+	nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
+	err = -EMSGSIZE;
+	if (nlh == NULL)
+		goto out_free_skb;
+
+	p = nlmsg_data(nlh);
+	if (c->event == XFRM_MSG_DELPOLICY) {
+		struct nlattr *attr;
+
+		id = nlmsg_data(nlh);
+		memset(id, 0, sizeof(*id));
+		id->dir = dir;
+		if (c->data.byid)
+			id->index = xp->index;
+		else
+			memcpy(&id->sel, &xp->selector, sizeof(id->sel));
+
+		attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
+		err = -EMSGSIZE;
+		if (attr == NULL)
+			goto out_free_skb;
+
+		p = nla_data(attr);
+	}
+
+	copy_to_user_policy(xp, p, dir);
+	err = copy_to_user_tmpl(xp, skb);
+	if (!err)
+		err = copy_to_user_policy_type(xp->type, skb);
+	if (!err)
+		err = xfrm_mark_put(skb, &xp->mark);
+	if (err)
+		goto out_free_skb;
+
+	nlmsg_end(skb, nlh);
+
+	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
+
+out_free_skb:
+	kfree_skb(skb);
+	return err;
+}
+
+static int xfrm_notify_policy_flush(const struct km_event *c)
+{
+	struct net *net = c->net;
+	struct nlmsghdr *nlh;
+	struct sk_buff *skb;
+	int err;
+
+	skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
+	if (skb == NULL)
+		return -ENOMEM;
+
+	nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
+	err = -EMSGSIZE;
+	if (nlh == NULL)
+		goto out_free_skb;
+	err = copy_to_user_policy_type(c->data.type, skb);
+	if (err)
+		goto out_free_skb;
+
+	nlmsg_end(skb, nlh);
+
+	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
+
+out_free_skb:
+	kfree_skb(skb);
+	return err;
+}
+
+static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
+{
+
+	switch (c->event) {
+	case XFRM_MSG_NEWPOLICY:
+	case XFRM_MSG_UPDPOLICY:
+	case XFRM_MSG_DELPOLICY:
+		return xfrm_notify_policy(xp, dir, c);
+	case XFRM_MSG_FLUSHPOLICY:
+		return xfrm_notify_policy_flush(c);
+	case XFRM_MSG_POLEXPIRE:
+		return xfrm_exp_policy_notify(xp, dir, c);
+	default:
+		printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
+		       c->event);
+	}
+
+	return 0;
+
+}
+
+static inline size_t xfrm_report_msgsize(void)
+{
+	return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
+}
+
+static int build_report(struct sk_buff *skb, u8 proto,
+			struct xfrm_selector *sel, xfrm_address_t *addr)
+{
+	struct xfrm_user_report *ur;
+	struct nlmsghdr *nlh;
+
+	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
+	if (nlh == NULL)
+		return -EMSGSIZE;
+
+	ur = nlmsg_data(nlh);
+	ur->proto = proto;
+	memcpy(&ur->sel, sel, sizeof(ur->sel));
+
+	if (addr) {
+		int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
+		if (err) {
+			nlmsg_cancel(skb, nlh);
+			return err;
+		}
+	}
+	nlmsg_end(skb, nlh);
+	return 0;
+}
+
+static int xfrm_send_report(struct net *net, u8 proto,
+			    struct xfrm_selector *sel, xfrm_address_t *addr)
+{
+	struct sk_buff *skb;
+
+	skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
+	if (skb == NULL)
+		return -ENOMEM;
+
+	if (build_report(skb, proto, sel, addr) < 0)
+		BUG();
+
+	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
+}
+
+static inline size_t xfrm_mapping_msgsize(void)
+{
+	return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
+}
+
+static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
+			 xfrm_address_t *new_saddr, __be16 new_sport)
+{
+	struct xfrm_user_mapping *um;
+	struct nlmsghdr *nlh;
+
+	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
+	if (nlh == NULL)
+		return -EMSGSIZE;
+
+	um = nlmsg_data(nlh);
+
+	memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
+	um->id.spi = x->id.spi;
+	um->id.family = x->props.family;
+	um->id.proto = x->id.proto;
+	memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
+	memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
+	um->new_sport = new_sport;
+	um->old_sport = x->encap->encap_sport;
+	um->reqid = x->props.reqid;
+
+	nlmsg_end(skb, nlh);
+	return 0;
+}
+
+static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
+			     __be16 sport)
+{
+	struct net *net = xs_net(x);
+	struct sk_buff *skb;
+
+	if (x->id.proto != IPPROTO_ESP)
+		return -EINVAL;
+
+	if (!x->encap)
+		return -EINVAL;
+
+	skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
+	if (skb == NULL)
+		return -ENOMEM;
+
+	if (build_mapping(skb, x, ipaddr, sport) < 0)
+		BUG();
+
+	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
+}
+
+static bool xfrm_is_alive(const struct km_event *c)
+{
+	return (bool)xfrm_acquire_is_on(c->net);
+}
+
+static struct xfrm_mgr netlink_mgr = {
+	.id		= "netlink",
+	.notify		= xfrm_send_state_notify,
+	.acquire	= xfrm_send_acquire,
+	.compile_policy	= xfrm_compile_policy,
+	.notify_policy	= xfrm_send_policy_notify,
+	.report		= xfrm_send_report,
+	.migrate	= xfrm_send_migrate,
+	.new_mapping	= xfrm_send_mapping,
+	.is_alive	= xfrm_is_alive,
+};
+
+static int __net_init xfrm_user_net_init(struct net *net)
+{
+	struct sock *nlsk;
+	struct netlink_kernel_cfg cfg = {
+		.groups	= XFRMNLGRP_MAX,
+		.input	= xfrm_netlink_rcv,
+	};
+
+	nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
+	if (nlsk == NULL)
+		return -ENOMEM;
+	net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
+	rcu_assign_pointer(net->xfrm.nlsk, nlsk);
+	return 0;
+}
+
+static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
+{
+	struct net *net;
+	list_for_each_entry(net, net_exit_list, exit_list)
+		RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
+	synchronize_net();
+	list_for_each_entry(net, net_exit_list, exit_list)
+		netlink_kernel_release(net->xfrm.nlsk_stash);
+}
+
+static struct pernet_operations xfrm_user_net_ops = {
+	.init	    = xfrm_user_net_init,
+	.exit_batch = xfrm_user_net_exit,
+};
+
+static int __init xfrm_user_init(void)
+{
+	int rv;
+
+	printk(KERN_INFO "Initializing XFRM netlink socket\n");
+
+	rv = register_pernet_subsys(&xfrm_user_net_ops);
+	if (rv < 0)
+		return rv;
+	rv = xfrm_register_km(&netlink_mgr);
+	if (rv < 0)
+		unregister_pernet_subsys(&xfrm_user_net_ops);
+	return rv;
+}
+
+static void __exit xfrm_user_exit(void)
+{
+	xfrm_unregister_km(&netlink_mgr);
+	unregister_pernet_subsys(&xfrm_user_net_ops);
+}
+
+module_init(xfrm_user_init);
+module_exit(xfrm_user_exit);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
+