1 files changed, 1253 insertions, 0 deletions

diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
new file mode 100644
index 000000000000..63661b0fd736
--- /dev/null
+++ b/net/xfrm/xfrm_user.c
@@ -0,0 +1,1253 @@
+/* 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/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/netlink.h>
+#include <linux/rtnetlink.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 <asm/uaccess.h>
+
+static struct sock *xfrm_nl;
+
+static int verify_one_alg(struct rtattr **xfrma, enum xfrm_attr_type_t type)
+{
+	struct rtattr *rt = xfrma[type - 1];
+	struct xfrm_algo *algp;
+
+	if (!rt)
+		return 0;
+
+	if ((rt->rta_len - sizeof(*rt)) < sizeof(*algp))
+		return -EINVAL;
+
+	algp = RTA_DATA(rt);
+	switch (type) {
+	case XFRMA_ALG_AUTH:
+		if (!algp->alg_key_len &&
+		    strcmp(algp->alg_name, "digest_null") != 0)
+			return -EINVAL;
+		break;
+
+	case XFRMA_ALG_CRYPT:
+		if (!algp->alg_key_len &&
+		    strcmp(algp->alg_name, "cipher_null") != 0)
+			return -EINVAL;
+		break;
+
+	case XFRMA_ALG_COMP:
+		/* Zero length keys are legal.  */
+		break;
+
+	default:
+		return -EINVAL;
+	};
+
+	algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
+	return 0;
+}
+
+static int verify_encap_tmpl(struct rtattr **xfrma)
+{
+	struct rtattr *rt = xfrma[XFRMA_ENCAP - 1];
+	struct xfrm_encap_tmpl *encap;
+
+	if (!rt)
+		return 0;
+
+	if ((rt->rta_len - sizeof(*rt)) < sizeof(*encap))
+		return -EINVAL;
+
+	return 0;
+}
+
+static int verify_newsa_info(struct xfrm_usersa_info *p,
+			     struct rtattr **xfrma)
+{
+	int err;
+
+	err = -EINVAL;
+	switch (p->family) {
+	case AF_INET:
+		break;
+
+	case AF_INET6:
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+		break;
+#else
+		err = -EAFNOSUPPORT;
+		goto out;
+#endif
+
+	default:
+		goto out;
+	};
+
+	err = -EINVAL;
+	switch (p->id.proto) {
+	case IPPROTO_AH:
+		if (!xfrma[XFRMA_ALG_AUTH-1]	||
+		    xfrma[XFRMA_ALG_CRYPT-1]	||
+		    xfrma[XFRMA_ALG_COMP-1])
+			goto out;
+		break;
+
+	case IPPROTO_ESP:
+		if ((!xfrma[XFRMA_ALG_AUTH-1] &&
+		     !xfrma[XFRMA_ALG_CRYPT-1])	||
+		    xfrma[XFRMA_ALG_COMP-1])
+			goto out;
+		break;
+
+	case IPPROTO_COMP:
+		if (!xfrma[XFRMA_ALG_COMP-1]	||
+		    xfrma[XFRMA_ALG_AUTH-1]	||
+		    xfrma[XFRMA_ALG_CRYPT-1])
+			goto out;
+		break;
+
+	default:
+		goto out;
+	};
+
+	if ((err = verify_one_alg(xfrma, XFRMA_ALG_AUTH)))
+		goto out;
+	if ((err = verify_one_alg(xfrma, XFRMA_ALG_CRYPT)))
+		goto out;
+	if ((err = verify_one_alg(xfrma, XFRMA_ALG_COMP)))
+		goto out;
+	if ((err = verify_encap_tmpl(xfrma)))
+		goto out;
+
+	err = -EINVAL;
+	switch (p->mode) {
+	case 0:
+	case 1:
+		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)(char *, int),
+			   struct rtattr *u_arg)
+{
+	struct rtattr *rta = u_arg;
+	struct xfrm_algo *p, *ualg;
+	struct xfrm_algo_desc *algo;
+
+	if (!rta)
+		return 0;
+
+	ualg = RTA_DATA(rta);
+
+	algo = get_byname(ualg->alg_name, 1);
+	if (!algo)
+		return -ENOSYS;
+	*props = algo->desc.sadb_alg_id;
+
+	p = kmalloc(sizeof(*ualg) + ualg->alg_key_len, GFP_KERNEL);
+	if (!p)
+		return -ENOMEM;
+
+	memcpy(p, ualg, sizeof(*ualg) + ualg->alg_key_len);
+	*algpp = p;
+	return 0;
+}
+
+static int attach_encap_tmpl(struct xfrm_encap_tmpl **encapp, struct rtattr *u_arg)
+{
+	struct rtattr *rta = u_arg;
+	struct xfrm_encap_tmpl *p, *uencap;
+
+	if (!rta)
+		return 0;
+
+	uencap = RTA_DATA(rta);
+	p = kmalloc(sizeof(*p), GFP_KERNEL);
+	if (!p)
+		return -ENOMEM;
+
+	memcpy(p, uencap, sizeof(*p));
+	*encapp = p;
+	return 0;
+}
+
+static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
+{
+	memcpy(&x->id, &p->id, sizeof(x->id));
+	memcpy(&x->sel, &p->sel, sizeof(x->sel));
+	memcpy(&x->lft, &p->lft, sizeof(x->lft));
+	x->props.mode = p->mode;
+	x->props.replay_window = p->replay_window;
+	x->props.reqid = p->reqid;
+	x->props.family = p->family;
+	x->props.saddr = p->saddr;
+	x->props.flags = p->flags;
+}
+
+static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
+					       struct rtattr **xfrma,
+					       int *errp)
+{
+	struct xfrm_state *x = xfrm_state_alloc();
+	int err = -ENOMEM;
+
+	if (!x)
+		goto error_no_put;
+
+	copy_from_user_state(x, p);
+
+	if ((err = attach_one_algo(&x->aalg, &x->props.aalgo,
+				   xfrm_aalg_get_byname,
+				   xfrma[XFRMA_ALG_AUTH-1])))
+		goto error;
+	if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
+				   xfrm_ealg_get_byname,
+				   xfrma[XFRMA_ALG_CRYPT-1])))
+		goto error;
+	if ((err = attach_one_algo(&x->calg, &x->props.calgo,
+				   xfrm_calg_get_byname,
+				   xfrma[XFRMA_ALG_COMP-1])))
+		goto error;
+	if ((err = attach_encap_tmpl(&x->encap, xfrma[XFRMA_ENCAP-1])))
+		goto error;
+
+	err = -ENOENT;
+	x->type = xfrm_get_type(x->id.proto, x->props.family);
+	if (x->type == NULL)
+		goto error;
+
+	err = x->type->init_state(x, NULL);
+	if (err)
+		goto error;
+
+	x->curlft.add_time = (unsigned long) xtime.tv_sec;
+	x->km.state = XFRM_STATE_VALID;
+	x->km.seq = p->seq;
+
+	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, void **xfrma)
+{
+	struct xfrm_usersa_info *p = NLMSG_DATA(nlh);
+	struct xfrm_state *x;
+	int err;
+
+	err = verify_newsa_info(p, (struct rtattr **) xfrma);
+	if (err)
+		return err;
+
+	x = xfrm_state_construct(p, (struct rtattr **) xfrma, &err);
+	if (!x)
+		return err;
+
+	if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
+		err = xfrm_state_add(x);
+	else
+		err = xfrm_state_update(x);
+
+	if (err < 0) {
+		x->km.state = XFRM_STATE_DEAD;
+		xfrm_state_put(x);
+	}
+
+	return err;
+}
+
+static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
+{
+	struct xfrm_state *x;
+	struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
+
+	x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
+	if (x == NULL)
+		return -ESRCH;
+
+	if (xfrm_state_kern(x)) {
+		xfrm_state_put(x);
+		return -EPERM;
+	}
+
+	xfrm_state_delete(x);
+	xfrm_state_put(x);
+
+	return 0;
+}
+
+static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
+{
+	memcpy(&p->id, &x->id, sizeof(p->id));
+	memcpy(&p->sel, &x->sel, sizeof(p->sel));
+	memcpy(&p->lft, &x->lft, sizeof(p->lft));
+	memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
+	memcpy(&p->stats, &x->stats, sizeof(p->stats));
+	p->saddr = x->props.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;
+	int start_idx;
+	int this_idx;
+};
+
+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;
+	unsigned char *b = skb->tail;
+
+	if (sp->this_idx < sp->start_idx)
+		goto out;
+
+	nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
+			sp->nlmsg_seq,
+			XFRM_MSG_NEWSA, sizeof(*p));
+	nlh->nlmsg_flags = sp->nlmsg_flags;
+
+	p = NLMSG_DATA(nlh);
+	copy_to_user_state(x, p);
+
+	if (x->aalg)
+		RTA_PUT(skb, XFRMA_ALG_AUTH,
+			sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
+	if (x->ealg)
+		RTA_PUT(skb, XFRMA_ALG_CRYPT,
+			sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
+	if (x->calg)
+		RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
+
+	if (x->encap)
+		RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
+
+	nlh->nlmsg_len = skb->tail - b;
+out:
+	sp->this_idx++;
+	return 0;
+
+nlmsg_failure:
+rtattr_failure:
+	skb_trim(skb, b - skb->data);
+	return -1;
+}
+
+static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	struct xfrm_dump_info info;
+
+	info.in_skb = cb->skb;
+	info.out_skb = skb;
+	info.nlmsg_seq = cb->nlh->nlmsg_seq;
+	info.nlmsg_flags = NLM_F_MULTI;
+	info.this_idx = 0;
+	info.start_idx = cb->args[0];
+	(void) xfrm_state_walk(IPSEC_PROTO_ANY, dump_one_state, &info);
+	cb->args[0] = info.this_idx;
+
+	return skb->len;
+}
+
+static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
+					  struct xfrm_state *x, u32 seq)
+{
+	struct xfrm_dump_info info;
+	struct sk_buff *skb;
+
+	skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
+	if (!skb)
+		return ERR_PTR(-ENOMEM);
+
+	NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
+	info.in_skb = in_skb;
+	info.out_skb = skb;
+	info.nlmsg_seq = seq;
+	info.nlmsg_flags = 0;
+	info.this_idx = info.start_idx = 0;
+
+	if (dump_one_state(x, 0, &info)) {
+		kfree_skb(skb);
+		return NULL;
+	}
+
+	return skb;
+}
+
+static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
+{
+	struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
+	struct xfrm_state *x;
+	struct sk_buff *resp_skb;
+	int err;
+
+	x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
+	err = -ESRCH;
+	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 = netlink_unicast(xfrm_nl, resp_skb,
+				      NETLINK_CB(skb).pid, MSG_DONTWAIT);
+	}
+	xfrm_state_put(x);
+out_noput:
+	return err;
+}
+
+static int verify_userspi_info(struct xfrm_userspi_info *p)
+{
+	switch (p->info.id.proto) {
+	case IPPROTO_AH:
+	case IPPROTO_ESP:
+		break;
+
+	case IPPROTO_COMP:
+		/* IPCOMP spi is 16-bits. */
+		if (p->max >= 0x10000)
+			return -EINVAL;
+		break;
+
+	default:
+		return -EINVAL;
+	};
+
+	if (p->min > p->max)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
+{
+	struct xfrm_state *x;
+	struct xfrm_userspi_info *p;
+	struct sk_buff *resp_skb;
+	xfrm_address_t *daddr;
+	int family;
+	int err;
+
+	p = NLMSG_DATA(nlh);
+	err = verify_userspi_info(p);
+	if (err)
+		goto out_noput;
+
+	family = p->info.family;
+	daddr = &p->info.id.daddr;
+
+	x = NULL;
+	if (p->info.seq) {
+		x = xfrm_find_acq_byseq(p->info.seq);
+		if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
+			xfrm_state_put(x);
+			x = NULL;
+		}
+	}
+
+	if (!x)
+		x = xfrm_find_acq(p->info.mode, p->info.reqid,
+				  p->info.id.proto, daddr,
+				  &p->info.saddr, 1,
+				  family);
+	err = -ENOENT;
+	if (x == NULL)
+		goto out_noput;
+
+	resp_skb = ERR_PTR(-ENOENT);
+
+	spin_lock_bh(&x->lock);
+	if (x->km.state != XFRM_STATE_DEAD) {
+		xfrm_alloc_spi(x, htonl(p->min), htonl(p->max));
+		if (x->id.spi)
+			resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
+	}
+	spin_unlock_bh(&x->lock);
+
+	if (IS_ERR(resp_skb)) {
+		err = PTR_ERR(resp_skb);
+		goto out;
+	}
+
+	err = netlink_unicast(xfrm_nl, resp_skb,
+			      NETLINK_CB(skb).pid, MSG_DONTWAIT);
+
+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_newpolicy_info(struct xfrm_userpolicy_info *p)
+{
+	switch (p->share) {
+	case XFRM_SHARE_ANY:
+	case XFRM_SHARE_SESSION:
+	case XFRM_SHARE_USER:
+	case XFRM_SHARE_UNIQUE:
+		break;
+
+	default:
+		return -EINVAL;
+	};
+
+	switch (p->action) {
+	case XFRM_POLICY_ALLOW:
+	case XFRM_POLICY_BLOCK:
+		break;
+
+	default:
+		return -EINVAL;
+	};
+
+	switch (p->sel.family) {
+	case AF_INET:
+		break;
+
+	case AF_INET6:
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+		break;
+#else
+		return  -EAFNOSUPPORT;
+#endif
+
+	default:
+		return -EINVAL;
+	};
+
+	return verify_policy_dir(p->dir);
+}
+
+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;
+	}
+}
+
+static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma)
+{
+	struct rtattr *rt = xfrma[XFRMA_TMPL-1];
+	struct xfrm_user_tmpl *utmpl;
+	int nr;
+
+	if (!rt) {
+		pol->xfrm_nr = 0;
+	} else {
+		nr = (rt->rta_len - sizeof(*rt)) / sizeof(*utmpl);
+
+		if (nr > XFRM_MAX_DEPTH)
+			return -EINVAL;
+
+		copy_templates(pol, RTA_DATA(rt), nr);
+	}
+	return 0;
+}
+
+static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
+{
+	xp->priority = p->priority;
+	xp->index = p->index;
+	memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
+	memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
+	xp->action = p->action;
+	xp->flags = p->flags;
+	xp->family = p->sel.family;
+	/* XXX xp->share = p->share; */
+}
+
+static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
+{
+	memcpy(&p->sel, &xp->selector, sizeof(p->sel));
+	memcpy(&p->lft, &xp->lft, sizeof(p->lft));
+	memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
+	p->priority = xp->priority;
+	p->index = xp->index;
+	p->sel.family = xp->family;
+	p->dir = dir;
+	p->action = xp->action;
+	p->flags = xp->flags;
+	p->share = XFRM_SHARE_ANY; /* XXX xp->share */
+}
+
+static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct rtattr **xfrma, int *errp)
+{
+	struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL);
+	int err;
+
+	if (!xp) {
+		*errp = -ENOMEM;
+		return NULL;
+	}
+
+	copy_from_user_policy(xp, p);
+	err = copy_from_user_tmpl(xp, xfrma);
+	if (err) {
+		*errp = err;
+		kfree(xp);
+		xp = NULL;
+	}
+
+	return xp;
+}
+
+static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
+{
+	struct xfrm_userpolicy_info *p = NLMSG_DATA(nlh);
+	struct xfrm_policy *xp;
+	int err;
+	int excl;
+
+	err = verify_newpolicy_info(p);
+	if (err)
+		return err;
+
+	xp = xfrm_policy_construct(p, (struct rtattr **) xfrma, &err);
+	if (!xp)
+		return err;
+
+	excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
+	err = xfrm_policy_insert(p->dir, xp, excl);
+	if (err) {
+		kfree(xp);
+		return err;
+	}
+
+	xfrm_pol_put(xp);
+
+	return 0;
+}
+
+static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
+{
+	struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
+	int i;
+
+	if (xp->xfrm_nr == 0)
+		return 0;
+
+	for (i = 0; i < xp->xfrm_nr; i++) {
+		struct xfrm_user_tmpl *up = &vec[i];
+		struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
+
+		memcpy(&up->id, &kp->id, sizeof(up->id));
+		up->family = xp->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;
+	}
+	RTA_PUT(skb, XFRMA_TMPL,
+		(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr),
+		vec);
+
+	return 0;
+
+rtattr_failure:
+	return -1;
+}
+
+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;
+	unsigned char *b = skb->tail;
+
+	if (sp->this_idx < sp->start_idx)
+		goto out;
+
+	nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
+			sp->nlmsg_seq,
+			XFRM_MSG_NEWPOLICY, sizeof(*p));
+	p = NLMSG_DATA(nlh);
+	nlh->nlmsg_flags = sp->nlmsg_flags;
+
+	copy_to_user_policy(xp, p, dir);
+	if (copy_to_user_tmpl(xp, skb) < 0)
+		goto nlmsg_failure;
+
+	nlh->nlmsg_len = skb->tail - b;
+out:
+	sp->this_idx++;
+	return 0;
+
+nlmsg_failure:
+	skb_trim(skb, b - skb->data);
+	return -1;
+}
+
+static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	struct xfrm_dump_info info;
+
+	info.in_skb = cb->skb;
+	info.out_skb = skb;
+	info.nlmsg_seq = cb->nlh->nlmsg_seq;
+	info.nlmsg_flags = NLM_F_MULTI;
+	info.this_idx = 0;
+	info.start_idx = cb->args[0];
+	(void) xfrm_policy_walk(dump_one_policy, &info);
+	cb->args[0] = info.this_idx;
+
+	return skb->len;
+}
+
+static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
+					  struct xfrm_policy *xp,
+					  int dir, u32 seq)
+{
+	struct xfrm_dump_info info;
+	struct sk_buff *skb;
+
+	skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
+	if (!skb)
+		return ERR_PTR(-ENOMEM);
+
+	NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
+	info.in_skb = in_skb;
+	info.out_skb = skb;
+	info.nlmsg_seq = seq;
+	info.nlmsg_flags = 0;
+	info.this_idx = info.start_idx = 0;
+
+	if (dump_one_policy(xp, dir, 0, &info) < 0) {
+		kfree_skb(skb);
+		return NULL;
+	}
+
+	return skb;
+}
+
+static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
+{
+	struct xfrm_policy *xp;
+	struct xfrm_userpolicy_id *p;
+	int err;
+	int delete;
+
+	p = NLMSG_DATA(nlh);
+	delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
+
+	err = verify_policy_dir(p->dir);
+	if (err)
+		return err;
+
+	if (p->index)
+		xp = xfrm_policy_byid(p->dir, p->index, delete);
+	else
+		xp = xfrm_policy_bysel(p->dir, &p->sel, delete);
+	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 = netlink_unicast(xfrm_nl, resp_skb,
+					      NETLINK_CB(skb).pid,
+					      MSG_DONTWAIT);
+		}
+	}
+
+	xfrm_pol_put(xp);
+
+	return err;
+}
+
+static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
+{
+	struct xfrm_usersa_flush *p = NLMSG_DATA(nlh);
+
+	xfrm_state_flush(p->proto);
+	return 0;
+}
+
+static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
+{
+	xfrm_policy_flush();
+	return 0;
+}
+
+static const int xfrm_msg_min[(XFRM_MSG_MAX + 1 - XFRM_MSG_BASE)] = {
+	NLMSG_LENGTH(sizeof(struct xfrm_usersa_info)),	/* NEW SA */
+	NLMSG_LENGTH(sizeof(struct xfrm_usersa_id)),	/* DEL SA */
+	NLMSG_LENGTH(sizeof(struct xfrm_usersa_id)),	/* GET SA */
+	NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_info)),/* NEW POLICY */
+	NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_id)),  /* DEL POLICY */
+	NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_id)),  /* GET POLICY */
+	NLMSG_LENGTH(sizeof(struct xfrm_userspi_info)),	/* ALLOC SPI */
+	NLMSG_LENGTH(sizeof(struct xfrm_user_acquire)),	/* ACQUIRE */
+	NLMSG_LENGTH(sizeof(struct xfrm_user_expire)),	/* EXPIRE */
+	NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_info)),/* UPD POLICY */
+	NLMSG_LENGTH(sizeof(struct xfrm_usersa_info)),	/* UPD SA */
+	NLMSG_LENGTH(sizeof(struct xfrm_user_polexpire)), /* POLEXPIRE */
+	NLMSG_LENGTH(sizeof(struct xfrm_usersa_flush)),	/* FLUSH SA */
+	NLMSG_LENGTH(0),				/* FLUSH POLICY */
+};
+
+static struct xfrm_link {
+	int (*doit)(struct sk_buff *, struct nlmsghdr *, void **);
+	int (*dump)(struct sk_buff *, struct netlink_callback *);
+} xfrm_dispatch[] = {
+	{	.doit	=	xfrm_add_sa, 		},
+	{	.doit	=	xfrm_del_sa, 		},
+	{
+		.doit	=	xfrm_get_sa,
+		.dump	=	xfrm_dump_sa,
+	},
+	{	.doit	=	xfrm_add_policy 	},
+	{	.doit	=	xfrm_get_policy 	},
+	{
+		.doit	=	xfrm_get_policy,
+		.dump	=	xfrm_dump_policy,
+	},
+	{	.doit	=	xfrm_alloc_userspi	},
+	{},
+	{},
+	{	.doit	=	xfrm_add_policy 	},
+	{	.doit	=	xfrm_add_sa, 		},
+	{},
+	{	.doit	=	xfrm_flush_sa		},
+	{	.doit	=	xfrm_flush_policy	},
+};
+
+static int xfrm_done(struct netlink_callback *cb)
+{
+	return 0;
+}
+
+static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
+{
+	struct rtattr *xfrma[XFRMA_MAX];
+	struct xfrm_link *link;
+	int type, min_len;
+
+	if (!(nlh->nlmsg_flags & NLM_F_REQUEST))
+		return 0;
+
+	type = nlh->nlmsg_type;
+
+	/* A control message: ignore them */
+	if (type < XFRM_MSG_BASE)
+		return 0;
+
+	/* Unknown message: reply with EINVAL */
+	if (type > XFRM_MSG_MAX)
+		goto err_einval;
+
+	type -= XFRM_MSG_BASE;
+	link = &xfrm_dispatch[type];
+
+	/* All operations require privileges, even GET */
+	if (security_netlink_recv(skb)) {
+		*errp = -EPERM;
+		return -1;
+	}
+
+	if ((type == 2 || type == 5) && (nlh->nlmsg_flags & NLM_F_DUMP)) {
+		u32 rlen;
+
+		if (link->dump == NULL)
+			goto err_einval;
+
+		if ((*errp = netlink_dump_start(xfrm_nl, skb, nlh,
+						link->dump,
+						xfrm_done)) != 0) {
+			return -1;
+		}
+		rlen = NLMSG_ALIGN(nlh->nlmsg_len);
+		if (rlen > skb->len)
+			rlen = skb->len;
+		skb_pull(skb, rlen);
+		return -1;
+	}
+
+	memset(xfrma, 0, sizeof(xfrma));
+
+	if (nlh->nlmsg_len < (min_len = xfrm_msg_min[type]))
+		goto err_einval;
+
+	if (nlh->nlmsg_len > min_len) {
+		int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
+		struct rtattr *attr = (void *) nlh + NLMSG_ALIGN(min_len);
+
+		while (RTA_OK(attr, attrlen)) {
+			unsigned short flavor = attr->rta_type;
+			if (flavor) {
+				if (flavor > XFRMA_MAX)
+					goto err_einval;
+				xfrma[flavor - 1] = attr;
+			}
+			attr = RTA_NEXT(attr, attrlen);
+		}
+	}
+
+	if (link->doit == NULL)
+		goto err_einval;
+	*errp = link->doit(skb, nlh, (void **) &xfrma);
+
+	return *errp;
+
+err_einval:
+	*errp = -EINVAL;
+	return -1;
+}
+
+static int xfrm_user_rcv_skb(struct sk_buff *skb)
+{
+	int err;
+	struct nlmsghdr *nlh;
+
+	while (skb->len >= NLMSG_SPACE(0)) {
+		u32 rlen;
+
+		nlh = (struct nlmsghdr *) skb->data;
+		if (nlh->nlmsg_len < sizeof(*nlh) ||
+		    skb->len < nlh->nlmsg_len)
+			return 0;
+		rlen = NLMSG_ALIGN(nlh->nlmsg_len);
+		if (rlen > skb->len)
+			rlen = skb->len;
+		if (xfrm_user_rcv_msg(skb, nlh, &err) < 0) {
+			if (err == 0)
+				return -1;
+			netlink_ack(skb, nlh, err);
+		} else if (nlh->nlmsg_flags & NLM_F_ACK)
+			netlink_ack(skb, nlh, 0);
+		skb_pull(skb, rlen);
+	}
+
+	return 0;
+}
+
+static void xfrm_netlink_rcv(struct sock *sk, int len)
+{
+	do {
+		struct sk_buff *skb;
+
+		down(&xfrm_cfg_sem);
+
+		while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
+			if (xfrm_user_rcv_skb(skb)) {
+				if (skb->len)
+					skb_queue_head(&sk->sk_receive_queue,
+						       skb);
+				else
+					kfree_skb(skb);
+				break;
+			}
+			kfree_skb(skb);
+		}
+
+		up(&xfrm_cfg_sem);
+
+	} while (xfrm_nl && xfrm_nl->sk_receive_queue.qlen);
+}
+
+static int build_expire(struct sk_buff *skb, struct xfrm_state *x, int hard)
+{
+	struct xfrm_user_expire *ue;
+	struct nlmsghdr *nlh;
+	unsigned char *b = skb->tail;
+
+	nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_EXPIRE,
+			sizeof(*ue));
+	ue = NLMSG_DATA(nlh);
+	nlh->nlmsg_flags = 0;
+
+	copy_to_user_state(x, &ue->state);
+	ue->hard = (hard != 0) ? 1 : 0;
+
+	nlh->nlmsg_len = skb->tail - b;
+	return skb->len;
+
+nlmsg_failure:
+	skb_trim(skb, b - skb->data);
+	return -1;
+}
+
+static int xfrm_send_state_notify(struct xfrm_state *x, int hard)
+{
+	struct sk_buff *skb;
+
+	skb = alloc_skb(sizeof(struct xfrm_user_expire) + 16, GFP_ATOMIC);
+	if (skb == NULL)
+		return -ENOMEM;
+
+	if (build_expire(skb, x, hard) < 0)
+		BUG();
+
+	NETLINK_CB(skb).dst_groups = XFRMGRP_EXPIRE;
+
+	return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_EXPIRE, GFP_ATOMIC);
+}
+
+static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
+			 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
+			 int dir)
+{
+	struct xfrm_user_acquire *ua;
+	struct nlmsghdr *nlh;
+	unsigned char *b = skb->tail;
+	__u32 seq = xfrm_get_acqseq();
+
+	nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_ACQUIRE,
+			sizeof(*ua));
+	ua = NLMSG_DATA(nlh);
+	nlh->nlmsg_flags = 0;
+
+	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, dir);
+	ua->aalgos = xt->aalgos;
+	ua->ealgos = xt->ealgos;
+	ua->calgos = xt->calgos;
+	ua->seq = x->km.seq = seq;
+
+	if (copy_to_user_tmpl(xp, skb) < 0)
+		goto nlmsg_failure;
+
+	nlh->nlmsg_len = skb->tail - b;
+	return skb->len;
+
+nlmsg_failure:
+	skb_trim(skb, b - skb->data);
+	return -1;
+}
+
+static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
+			     struct xfrm_policy *xp, int dir)
+{
+	struct sk_buff *skb;
+	size_t len;
+
+	len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
+	len += NLMSG_SPACE(sizeof(struct xfrm_user_acquire));
+	skb = alloc_skb(len, GFP_ATOMIC);
+	if (skb == NULL)
+		return -ENOMEM;
+
+	if (build_acquire(skb, x, xt, xp, dir) < 0)
+		BUG();
+
+	NETLINK_CB(skb).dst_groups = XFRMGRP_ACQUIRE;
+
+	return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_ACQUIRE, GFP_ATOMIC);
+}
+
+/* User gives us xfrm_user_policy_info followed by an array of 0
+ * or more templates.
+ */
+static struct xfrm_policy *xfrm_compile_policy(u16 family, int opt,
+					       u8 *data, int len, int *dir)
+{
+	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 (family) {
+	case AF_INET:
+		if (opt != IP_XFRM_POLICY) {
+			*dir = -EOPNOTSUPP;
+			return NULL;
+		}
+		break;
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+	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 (nr > XFRM_MAX_DEPTH)
+		return NULL;
+
+	xp = xfrm_policy_alloc(GFP_KERNEL);
+	if (xp == NULL) {
+		*dir = -ENOBUFS;
+		return NULL;
+	}
+
+	copy_from_user_policy(xp, p);
+	copy_templates(xp, ut, nr);
+
+	*dir = p->dir;
+
+	return xp;
+}
+
+static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
+			   int dir, int hard)
+{
+	struct xfrm_user_polexpire *upe;
+	struct nlmsghdr *nlh;
+	unsigned char *b = skb->tail;
+
+	nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe));
+	upe = NLMSG_DATA(nlh);
+	nlh->nlmsg_flags = 0;
+
+	copy_to_user_policy(xp, &upe->pol, dir);
+	if (copy_to_user_tmpl(xp, skb) < 0)
+		goto nlmsg_failure;
+	upe->hard = !!hard;
+
+	nlh->nlmsg_len = skb->tail - b;
+	return skb->len;
+
+nlmsg_failure:
+	skb_trim(skb, b - skb->data);
+	return -1;
+}
+
+static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, int hard)
+{
+	struct sk_buff *skb;
+	size_t len;
+
+	len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
+	len += NLMSG_SPACE(sizeof(struct xfrm_user_polexpire));
+	skb = alloc_skb(len, GFP_ATOMIC);
+	if (skb == NULL)
+		return -ENOMEM;
+
+	if (build_polexpire(skb, xp, dir, hard) < 0)
+		BUG();
+
+	NETLINK_CB(skb).dst_groups = XFRMGRP_EXPIRE;
+
+	return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_EXPIRE, GFP_ATOMIC);
+}
+
+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,
+};
+
+static int __init xfrm_user_init(void)
+{
+	printk(KERN_INFO "Initializing IPsec netlink socket\n");
+
+	xfrm_nl = netlink_kernel_create(NETLINK_XFRM, xfrm_netlink_rcv);
+	if (xfrm_nl == NULL)
+		return -ENOMEM;
+
+	xfrm_register_km(&netlink_mgr);
+
+	return 0;
+}
+
+static void __exit xfrm_user_exit(void)
+{
+	xfrm_unregister_km(&netlink_mgr);
+	sock_release(xfrm_nl->sk_socket);
+}
+
+module_init(xfrm_user_init);
+module_exit(xfrm_user_exit);
+MODULE_LICENSE("GPL");