Message-Id: <20170121000507.34381-4-cernekee@chromium.org>
Date:   Fri, 20 Jan 2017 16:05:06 -0800
From:   Kevin Cernekee <cernekee@...omium.org>
To:     steffen.klassert@...unet.com, herbert@...dor.apana.org.au,
        davem@...emloft.net, paul@...l-moore.com, sds@...ho.nsa.gov,
        eparis@...isplace.org
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        selinux@...ho.nsa.gov, fw@...len.de, fan.du@...driver.com,
        dianders@...omium.org, dtor@...omium.org
Subject: [PATCH 3/4] xfrm_user: Initial commit of xfrm_user_legacy.c

Several xfrm_* structs are incompatible between 32bit and 64bit builds:

    xfrm_usersa_info 220 bytes on i386 -> 224 bytes on amd64
    xfrm_userpolicy_info 164 -> 168
    xfrm_userspi_info 228 -> 232, offset mismatch on min
    xfrm_user_acquire 276 -> 280, offset mismatch on aalgos
    xfrm_user_expire 224 -> 232, offset mismatch on hard
    xfrm_user_polexpire 168 -> 176, offset mismatch on hard

Fork all of the functions that handle these structs into a new file so
that it is possible to support both legacy + new layouts.

This commit contains an exact copy of the necessary functions from
xfrm_user.c, for ease of reviewing.  The next commit will contain all
of the changes needed to make these functions handle legacy messages
correctly.

Signed-off-by: Kevin Cernekee <cernekee@...omium.org>
---
 net/xfrm/Kconfig            |   14 +
 net/xfrm/Makefile           |    8 +-
 net/xfrm/xfrm_user_legacy.c | 1091 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 1112 insertions(+), 1 deletion(-)
 create mode 100644 net/xfrm/xfrm_user_legacy.c

diff --git a/net/xfrm/Kconfig b/net/xfrm/Kconfig
index bda1a13628a8..317dcc411345 100644
--- a/net/xfrm/Kconfig
+++ b/net/xfrm/Kconfig
@@ -20,6 +20,20 @@ config XFRM_USER
 
 	  If unsure, say Y.
 
+config XFRM_USER_LEGACY
+	tristate "Legacy transformation user configuration interface"
+	depends on XFRM_USER
+	default y
+	---help---
+	  The original Transformation(XFRM) netlink messages were not
+	  compatible between 32-bit programs and 64-bit kernels, so they
+	  have been deprecated.  Enable this option if you have existing
+	  binaries that rely on the old format messages.  Disable this
+	  option if you know that all users of the interface have been
+	  built against recent kernel headers.
+
+	  If unsure, say Y.
+
 config XFRM_SUB_POLICY
 	bool "Transformation sub policy support"
 	depends on XFRM
diff --git a/net/xfrm/Makefile b/net/xfrm/Makefile
index c0e961983f17..6cf6f8da3dc8 100644
--- a/net/xfrm/Makefile
+++ b/net/xfrm/Makefile
@@ -7,5 +7,11 @@ obj-$(CONFIG_XFRM) := xfrm_policy.o xfrm_state.o xfrm_hash.o \
 		      xfrm_sysctl.o xfrm_replay.o
 obj-$(CONFIG_XFRM_STATISTICS) += xfrm_proc.o
 obj-$(CONFIG_XFRM_ALGO) += xfrm_algo.o
-obj-$(CONFIG_XFRM_USER) += xfrm_user.o
+
+xfrm-user-objs := xfrm_user.o
+ifneq ($(CONFIG_XFRM_USER_LEGACY),)
+xfrm-user-objs += xfrm_user_legacy.o
+endif
+obj-$(CONFIG_XFRM_USER) += xfrm-user.o
+
 obj-$(CONFIG_XFRM_IPCOMP) += xfrm_ipcomp.o
diff --git a/net/xfrm/xfrm_user_legacy.c b/net/xfrm/xfrm_user_legacy.c
new file mode 100644
index 000000000000..058accfefc83
--- /dev/null
+++ b/net/xfrm/xfrm_user_legacy.c
@@ -0,0 +1,1091 @@
+/* xfrm_user.c: User interface to configure xfrm engine.
+ *
+ * Copyright (C) 2002 David S. Miller (davem@...hat.com)
+ *
+ * Changes:
+ *	Mitsuru KANDA @USAGI
+ * 	Kazunori MIYAZAWA @USAGI
+ * 	Kunihiro Ishiguro <kunihiro@...nfusion.com>
+ * 		IPv6 support
+ *
+ */
+
+#include <linux/crypto.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/security.h>
+#include <net/sock.h>
+#include <net/xfrm.h>
+#include <net/netlink.h>
+#include <net/ah.h>
+#include <linux/uaccess.h>
+#include <asm/unaligned.h>
+#include "xfrm_user.h"
+
+static int xfrm_add_sa(struct sk_buff *skb, const struct nlmsghdr *nlh,
+		       struct nlattr **attrs)
+{
+	struct net *net = sock_net(skb->sk);
+	const struct xfrm_usersa_info *p = nlmsg_data(nlh);
+	struct xfrm_state *x;
+	int err;
+	struct km_event c;
+
+	err = xfrm_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 int xfrm_del_sa(struct sk_buff *skb, const struct nlmsghdr *nlh,
+		       struct nlattr **attrs)
+{
+	struct net *net = sock_net(skb->sk);
+	struct xfrm_state *x;
+	int err = -ESRCH;
+	struct km_event c;
+	const 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(const 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));
+	put_unaligned(x->stats.replay_window, &p->stats.replay_window);
+	put_unaligned(x->stats.replay, &p->stats.replay);
+	put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
+	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;
+}
+
+static int copy_to_user_state_extra(const 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_64bit(skb, XFRMA_LASTUSED, x->lastused,
+					XFRMA_PAD);
+		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 = xfrm_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 = xfrm_copy_sec_ctx(x->security, skb);
+out:
+	return ret;
+}
+
+static int dump_one_state(const 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);
+
+	if (cb->args[0])
+		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;
+
+		err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX,
+				  xfrma_policy);
+		if (err < 0)
+			return err;
+
+		if (attrs[XFRMA_ADDRESS_FILTER]) {
+			filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
+					 sizeof(*filter), GFP_KERNEL);
+			if (filter == NULL)
+				return -ENOMEM;
+		}
+
+		if (attrs[XFRMA_PROTO])
+			proto = nla_get_u8(attrs[XFRMA_PROTO]);
+
+		xfrm_state_walk_init(walk, proto, filter);
+		cb->args[0] = 1;
+	}
+
+	(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,
+					  const 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;
+}
+
+static int xfrm_get_sa(struct sk_buff *skb, const struct nlmsghdr *nlh,
+		       struct nlattr **attrs)
+{
+	struct net *net = sock_net(skb->sk);
+	const 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, const struct nlmsghdr *nlh,
+			      struct nlattr **attrs)
+{
+	struct net *net = sock_net(skb->sk);
+	struct xfrm_state *x;
+	const struct xfrm_userspi_info *p;
+	struct sk_buff *resp_skb;
+	const 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 void copy_to_user_policy(const 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 int xfrm_add_policy(struct sk_buff *skb, const struct nlmsghdr *nlh,
+			   struct nlattr **attrs)
+{
+	struct net *net = sock_net(skb->sk);
+	const struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
+	struct xfrm_policy *xp;
+	struct km_event c;
+	int err;
+	int excl;
+
+	err = xfrm_verify_newpolicy_info(p);
+	if (err)
+		return err;
+	err = xfrm_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 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
+}
+
+static int dump_one_policy(const 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 = xfrm_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,
+					   const 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, const struct nlmsghdr *nlh,
+			   struct nlattr **attrs)
+{
+	struct net *net = sock_net(skb->sk);
+	struct xfrm_policy *xp;
+	const 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 = xfrm_copy_from_user_policy_type(&type, attrs);
+	if (err)
+		return err;
+
+	err = xfrm_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 = xfrm_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_add_pol_expire(struct sk_buff *skb, const struct nlmsghdr *nlh,
+			       struct nlattr **attrs)
+{
+	struct net *net = sock_net(skb->sk);
+	struct xfrm_policy *xp;
+	const struct xfrm_user_polexpire *up = nlmsg_data(nlh);
+	const 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 = xfrm_copy_from_user_policy_type(&type, attrs);
+	if (err)
+		return err;
+
+	err = xfrm_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 = xfrm_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);
+	}
+	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, const struct nlmsghdr *nlh,
+			      struct nlattr **attrs)
+{
+	struct net *net = sock_net(skb->sk);
+	struct xfrm_state *x;
+	int err;
+	const struct xfrm_user_expire *ue = nlmsg_data(nlh);
+	const 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, const 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;
+
+	const 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 = xfrm_verify_newpolicy_info(&ua->policy);
+	if (err)
+		goto free_state;
+
+	/*   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;
+
+free_state:
+	kfree(x);
+nomem:
+	return err;
+}
+
+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,
+			const 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(const 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_notify_sa(const 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 inline size_t xfrm_acquire_msgsize(const struct xfrm_state *x,
+					  const 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,
+			 const struct xfrm_tmpl *xt,
+			 const 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 = xfrm_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,
+			     const struct xfrm_tmpl *xt,
+			     const 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);
+}
+
+static inline size_t xfrm_polexpire_msgsize(const 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,
+			   const 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 = xfrm_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(const 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(const 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 = xfrm_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;
+}
-- 
2.11.0.483.g087da7b7c-goog

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