[mirror_ubuntu-artful-kernel.git] / net / xfrm / xfrm_input.c

/*
 * xfrm_input.c
 *
 * Changes:
 * 	YOSHIFUJI Hideaki @USAGI
 * 		Split up af-specific portion
 *
 */

#include <linux/slab.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <net/dst.h>
#include <net/ip.h>
#include <net/xfrm.h>
#include <net/ip_tunnels.h>
#include <net/ip6_tunnel.h>

static struct kmem_cache *secpath_cachep __read_mostly;

static DEFINE_SPINLOCK(xfrm_input_afinfo_lock);
static struct xfrm_input_afinfo const __rcu *xfrm_input_afinfo[AF_INET6 + 1];

static struct gro_cells gro_cells;
static struct net_device xfrm_napi_dev;

int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo)
{
	int err = 0;

	if (WARN_ON(afinfo->family >= ARRAY_SIZE(xfrm_input_afinfo)))
		return -EAFNOSUPPORT;

	spin_lock_bh(&xfrm_input_afinfo_lock);
	if (unlikely(xfrm_input_afinfo[afinfo->family] != NULL))
		err = -EEXIST;
	else
		rcu_assign_pointer(xfrm_input_afinfo[afinfo->family], afinfo);
	spin_unlock_bh(&xfrm_input_afinfo_lock);
	return err;
}
EXPORT_SYMBOL(xfrm_input_register_afinfo);

int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo)
{
	int err = 0;

	spin_lock_bh(&xfrm_input_afinfo_lock);
	if (likely(xfrm_input_afinfo[afinfo->family] != NULL)) {
		if (unlikely(xfrm_input_afinfo[afinfo->family] != afinfo))
			err = -EINVAL;
		else
			RCU_INIT_POINTER(xfrm_input_afinfo[afinfo->family], NULL);
	}
	spin_unlock_bh(&xfrm_input_afinfo_lock);
	synchronize_rcu();
	return err;
}
EXPORT_SYMBOL(xfrm_input_unregister_afinfo);

static const struct xfrm_input_afinfo *xfrm_input_get_afinfo(unsigned int family)
{
	const struct xfrm_input_afinfo *afinfo;

	if (WARN_ON_ONCE(family >= ARRAY_SIZE(xfrm_input_afinfo)))
		return NULL;

	rcu_read_lock();
	afinfo = rcu_dereference(xfrm_input_afinfo[family]);
	if (unlikely(!afinfo))
		rcu_read_unlock();
	return afinfo;
}

static int xfrm_rcv_cb(struct sk_buff *skb, unsigned int family, u8 protocol,
		       int err)
{
	int ret;
	const struct xfrm_input_afinfo *afinfo = xfrm_input_get_afinfo(family);

	if (!afinfo)
		return -EAFNOSUPPORT;

	ret = afinfo->callback(skb, protocol, err);
	rcu_read_unlock();

	return ret;
}

void __secpath_destroy(struct sec_path *sp)
{
	int i;
	for (i = 0; i < sp->len; i++)
		xfrm_state_put(sp->xvec[i]);
	kmem_cache_free(secpath_cachep, sp);
}
EXPORT_SYMBOL(__secpath_destroy);

struct sec_path *secpath_dup(struct sec_path *src)
{
	struct sec_path *sp;

	sp = kmem_cache_alloc(secpath_cachep, GFP_ATOMIC);
	if (!sp)
		return NULL;

	sp->len = 0;
	if (src) {
		int i;

		memcpy(sp, src, sizeof(*sp));
		for (i = 0; i < sp->len; i++)
			xfrm_state_hold(sp->xvec[i]);
	}
	atomic_set(&sp->refcnt, 1);
	return sp;
}
EXPORT_SYMBOL(secpath_dup);

/* Fetch spi and seq from ipsec header */

int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq)
{
	int offset, offset_seq;
	int hlen;

	switch (nexthdr) {
	case IPPROTO_AH:
		hlen = sizeof(struct ip_auth_hdr);
		offset = offsetof(struct ip_auth_hdr, spi);
		offset_seq = offsetof(struct ip_auth_hdr, seq_no);
		break;
	case IPPROTO_ESP:
		hlen = sizeof(struct ip_esp_hdr);
		offset = offsetof(struct ip_esp_hdr, spi);
		offset_seq = offsetof(struct ip_esp_hdr, seq_no);
		break;
	case IPPROTO_COMP:
		if (!pskb_may_pull(skb, sizeof(struct ip_comp_hdr)))
			return -EINVAL;
		*spi = htonl(ntohs(*(__be16 *)(skb_transport_header(skb) + 2)));
		*seq = 0;
		return 0;
	default:
		return 1;
	}

	if (!pskb_may_pull(skb, hlen))
		return -EINVAL;

	*spi = *(__be32 *)(skb_transport_header(skb) + offset);
	*seq = *(__be32 *)(skb_transport_header(skb) + offset_seq);
	return 0;
}

int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb)
{
	struct xfrm_mode *inner_mode = x->inner_mode;
	int err;

	err = x->outer_mode->afinfo->extract_input(x, skb);
	if (err)
		return err;

	if (x->sel.family == AF_UNSPEC) {
		inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
		if (inner_mode == NULL)
			return -EAFNOSUPPORT;
	}

	skb->protocol = inner_mode->afinfo->eth_proto;
	return inner_mode->input2(x, skb);
}
EXPORT_SYMBOL(xfrm_prepare_input);

int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
{
	struct net *net = dev_net(skb->dev);
	int err;
	__be32 seq;
	__be32 seq_hi;
	struct xfrm_state *x = NULL;
	xfrm_address_t *daddr;
	struct xfrm_mode *inner_mode;
	u32 mark = skb->mark;
	unsigned int family;
	int decaps = 0;
	int async = 0;

	/* A negative encap_type indicates async resumption. */
	if (encap_type < 0) {
		async = 1;
		x = xfrm_input_state(skb);
		seq = XFRM_SKB_CB(skb)->seq.input.low;
		family = x->outer_mode->afinfo->family;
		goto resume;
	}

	daddr = (xfrm_address_t *)(skb_network_header(skb) +
				   XFRM_SPI_SKB_CB(skb)->daddroff);
	family = XFRM_SPI_SKB_CB(skb)->family;

	/* if tunnel is present override skb->mark value with tunnel i_key */
	switch (family) {
	case AF_INET:
		if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
			mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4->parms.i_key);
		break;
	case AF_INET6:
		if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
			mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6->parms.i_key);
		break;
	}

	/* Allocate new secpath or COW existing one. */
	if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) {
		struct sec_path *sp;

		sp = secpath_dup(skb->sp);
		if (!sp) {
			XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
			goto drop;
		}
		if (skb->sp)
			secpath_put(skb->sp);
		skb->sp = sp;
	}

	seq = 0;
	if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) {
		XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
		goto drop;
	}

	do {
		if (skb->sp->len == XFRM_MAX_DEPTH) {
			XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
			goto drop;
		}

		x = xfrm_state_lookup(net, mark, daddr, spi, nexthdr, family);
		if (x == NULL) {
			XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES);
			xfrm_audit_state_notfound(skb, family, spi, seq);
			goto drop;
		}

		skb->sp->xvec[skb->sp->len++] = x;

		spin_lock(&x->lock);

		if (unlikely(x->km.state != XFRM_STATE_VALID)) {
			if (x->km.state == XFRM_STATE_ACQ)
				XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
			else
				XFRM_INC_STATS(net,
					       LINUX_MIB_XFRMINSTATEINVALID);
			goto drop_unlock;
		}

		if ((x->encap ? x->encap->encap_type : 0) != encap_type) {
			XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
			goto drop_unlock;
		}

		if (x->repl->check(x, skb, seq)) {
			XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
			goto drop_unlock;
		}

		if (xfrm_state_check_expire(x)) {
			XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED);
			goto drop_unlock;
		}

		spin_unlock(&x->lock);

		if (xfrm_tunnel_check(skb, x, family)) {
			XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
			goto drop;
		}

		seq_hi = htonl(xfrm_replay_seqhi(x, seq));

		XFRM_SKB_CB(skb)->seq.input.low = seq;
		XFRM_SKB_CB(skb)->seq.input.hi = seq_hi;

		skb_dst_force(skb);
		dev_hold(skb->dev);

		nexthdr = x->type->input(x, skb);

		if (nexthdr == -EINPROGRESS)
			return 0;
resume:
		dev_put(skb->dev);

		spin_lock(&x->lock);
		if (nexthdr <= 0) {
			if (nexthdr == -EBADMSG) {
				xfrm_audit_state_icvfail(x, skb,
							 x->type->proto);
				x->stats.integrity_failed++;
			}
			XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
			goto drop_unlock;
		}

		/* only the first xfrm gets the encap type */
		encap_type = 0;

		if (async && x->repl->recheck(x, skb, seq)) {
			XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
			goto drop_unlock;
		}

		x->repl->advance(x, seq);

		x->curlft.bytes += skb->len;
		x->curlft.packets++;

		spin_unlock(&x->lock);

		XFRM_MODE_SKB_CB(skb)->protocol = nexthdr;

		inner_mode = x->inner_mode;

		if (x->sel.family == AF_UNSPEC) {
			inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
			if (inner_mode == NULL) {
				XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
				goto drop;
			}
		}

		if (inner_mode->input(x, skb)) {
			XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
			goto drop;
		}

		if (x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) {
			decaps = 1;
			break;
		}

		/*
		 * We need the inner address.  However, we only get here for
		 * transport mode so the outer address is identical.
		 */
		daddr = &x->id.daddr;
		family = x->outer_mode->afinfo->family;

		err = xfrm_parse_spi(skb, nexthdr, &spi, &seq);
		if (err < 0) {
			XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
			goto drop;
		}
	} while (!err);

	err = xfrm_rcv_cb(skb, family, x->type->proto, 0);
	if (err)
		goto drop;

	nf_reset(skb);

	if (decaps) {
		skb_dst_drop(skb);
		gro_cells_receive(&gro_cells, skb);
		return 0;
	} else {
		return x->inner_mode->afinfo->transport_finish(skb, async);
	}

drop_unlock:
	spin_unlock(&x->lock);
drop:
	xfrm_rcv_cb(skb, family, x && x->type ? x->type->proto : nexthdr, -1);
	kfree_skb(skb);
	return 0;
}
EXPORT_SYMBOL(xfrm_input);

int xfrm_input_resume(struct sk_buff *skb, int nexthdr)
{
	return xfrm_input(skb, nexthdr, 0, -1);
}
EXPORT_SYMBOL(xfrm_input_resume);

void __init xfrm_input_init(void)
{
	int err;

	init_dummy_netdev(&xfrm_napi_dev);
	err = gro_cells_init(&gro_cells, &xfrm_napi_dev);
	if (err)
		gro_cells.cells = NULL;

	secpath_cachep = kmem_cache_create("secpath_cache",
					   sizeof(struct sec_path),
					   0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
					   NULL);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* xfrm_input.c
	3	*
	4	* Changes:
	5	* YOSHIFUJI Hideaki @USAGI
	6	* Split up af-specific portion
a716c119	7	*
1da177e4 LT	8	*/
	9
	10	#include <linux/slab.h>
	11	#include <linux/module.h>
716062fd HX	12	#include <linux/netdevice.h>
716062fd HX	13	#include <net/dst.h>
1da177e4 LT	14	#include <net/ip.h>
1da177e4 LT	15	#include <net/xfrm.h>
049f8e2e AD	16	#include <net/ip_tunnels.h>
049f8e2e AD	17	#include <net/ip6_tunnel.h>
1da177e4	18
e18b890b	19	static struct kmem_cache *secpath_cachep __read_mostly;
1da177e4	20
2f32b51b	21	static DEFINE_SPINLOCK(xfrm_input_afinfo_lock);
960fdfde	22	static struct xfrm_input_afinfo const __rcu *xfrm_input_afinfo[AF_INET6 + 1];
2f32b51b	23
1995876a SK	24	static struct gro_cells gro_cells;
	25	static struct net_device xfrm_napi_dev;
	26
960fdfde	27	int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo)
2f32b51b SK	28	{
	29	int err = 0;
	30
960fdfde	31	if (WARN_ON(afinfo->family >= ARRAY_SIZE(xfrm_input_afinfo)))
2f32b51b	32	return -EAFNOSUPPORT;
960fdfde	33
2f32b51b SK	34	spin_lock_bh(&xfrm_input_afinfo_lock);
2f32b51b SK	35	if (unlikely(xfrm_input_afinfo[afinfo->family] != NULL))
f31e8d4f	36	err = -EEXIST;
2f32b51b SK	37	else
	38	rcu_assign_pointer(xfrm_input_afinfo[afinfo->family], afinfo);
	39	spin_unlock_bh(&xfrm_input_afinfo_lock);
	40	return err;
	41	}
	42	EXPORT_SYMBOL(xfrm_input_register_afinfo);
	43
960fdfde	44	int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo)
2f32b51b SK	45	{
	46	int err = 0;
	47
2f32b51b SK	48	spin_lock_bh(&xfrm_input_afinfo_lock);
	49	if (likely(xfrm_input_afinfo[afinfo->family] != NULL)) {
	50	if (unlikely(xfrm_input_afinfo[afinfo->family] != afinfo))
	51	err = -EINVAL;
	52	else
	53	RCU_INIT_POINTER(xfrm_input_afinfo[afinfo->family], NULL);
	54	}
	55	spin_unlock_bh(&xfrm_input_afinfo_lock);
	56	synchronize_rcu();
	57	return err;
	58	}
	59	EXPORT_SYMBOL(xfrm_input_unregister_afinfo);
	60
960fdfde	61	static const struct xfrm_input_afinfo *xfrm_input_get_afinfo(unsigned int family)
2f32b51b	62	{
960fdfde	63	const struct xfrm_input_afinfo *afinfo;
2f32b51b	64
960fdfde	65	if (WARN_ON_ONCE(family >= ARRAY_SIZE(xfrm_input_afinfo)))
2f32b51b	66	return NULL;
960fdfde	67
2f32b51b SK	68	rcu_read_lock();
	69	afinfo = rcu_dereference(xfrm_input_afinfo[family]);
	70	if (unlikely(!afinfo))
	71	rcu_read_unlock();
	72	return afinfo;
	73	}
	74
2f32b51b SK	75	static int xfrm_rcv_cb(struct sk_buff *skb, unsigned int family, u8 protocol,
	76	int err)
	77	{
	78	int ret;
960fdfde	79	const struct xfrm_input_afinfo *afinfo = xfrm_input_get_afinfo(family);
2f32b51b SK	80
	81	if (!afinfo)
	82	return -EAFNOSUPPORT;
	83
	84	ret = afinfo->callback(skb, protocol, err);
960fdfde	85	rcu_read_unlock();
2f32b51b SK	86
	87	return ret;
	88	}
	89
1da177e4 LT	90	void __secpath_destroy(struct sec_path *sp)
	91	{
	92	int i;
	93	for (i = 0; i < sp->len; i++)
dbe5b4aa	94	xfrm_state_put(sp->xvec[i]);
1da177e4 LT	95	kmem_cache_free(secpath_cachep, sp);
	96	}
	97	EXPORT_SYMBOL(__secpath_destroy);
	98
	99	struct sec_path secpath_dup(struct sec_path src)
	100	{
	101	struct sec_path *sp;
	102
54e6ecb2	103	sp = kmem_cache_alloc(secpath_cachep, GFP_ATOMIC);
1da177e4 LT	104	if (!sp)
	105	return NULL;
	106
	107	sp->len = 0;
	108	if (src) {
	109	int i;
	110
	111	memcpy(sp, src, sizeof(*sp));
	112	for (i = 0; i < sp->len; i++)
dbe5b4aa	113	xfrm_state_hold(sp->xvec[i]);
1da177e4 LT	114	}
	115	atomic_set(&sp->refcnt, 1);
	116	return sp;
	117	}
	118	EXPORT_SYMBOL(secpath_dup);
	119
	120	/* Fetch spi and seq from ipsec header */
	121
6067b2ba	122	int xfrm_parse_spi(struct sk_buff skb, u8 nexthdr, __be32 spi, __be32 *seq)
1da177e4 LT	123	{
1da177e4 LT	124	int offset, offset_seq;
44072500	125	int hlen;
1da177e4 LT	126
	127	switch (nexthdr) {
	128	case IPPROTO_AH:
44072500	129	hlen = sizeof(struct ip_auth_hdr);
1da177e4 LT	130	offset = offsetof(struct ip_auth_hdr, spi);
	131	offset_seq = offsetof(struct ip_auth_hdr, seq_no);
	132	break;
	133	case IPPROTO_ESP:
44072500	134	hlen = sizeof(struct ip_esp_hdr);
1da177e4 LT	135	offset = offsetof(struct ip_esp_hdr, spi);
	136	offset_seq = offsetof(struct ip_esp_hdr, seq_no);
	137	break;
	138	case IPPROTO_COMP:
	139	if (!pskb_may_pull(skb, sizeof(struct ip_comp_hdr)))
	140	return -EINVAL;
3e94c2dc	141	spi = htonl(ntohs((__be16 *)(skb_transport_header(skb) + 2)));
1da177e4 LT	142	*seq = 0;
	143	return 0;
	144	default:
	145	return 1;
	146	}
	147
44072500	148	if (!pskb_may_pull(skb, hlen))
1da177e4 LT	149	return -EINVAL;
1da177e4 LT	150
3e94c2dc WC	151	spi = (__be32 *)(skb_transport_header(skb) + offset);
3e94c2dc WC	152	seq = (__be32 *)(skb_transport_header(skb) + offset_seq);
1da177e4 LT	153	return 0;
1da177e4 LT	154	}
1da177e4	155
227620e2 HX	156	int xfrm_prepare_input(struct xfrm_state x, struct sk_buff skb)
227620e2 HX	157	{
df9dcb45	158	struct xfrm_mode *inner_mode = x->inner_mode;
227620e2 HX	159	int err;
	160
	161	err = x->outer_mode->afinfo->extract_input(x, skb);
	162	if (err)
	163	return err;
	164
df9dcb45 KM	165	if (x->sel.family == AF_UNSPEC) {
	166	inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
	167	if (inner_mode == NULL)
	168	return -EAFNOSUPPORT;
	169	}
	170
	171	skb->protocol = inner_mode->afinfo->eth_proto;
	172	return inner_mode->input2(x, skb);
227620e2 HX	173	}
	174	EXPORT_SYMBOL(xfrm_prepare_input);
	175
716062fd HX	176	int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
716062fd HX	177	{
bd235e3c	178	struct net *net = dev_net(skb->dev);
716062fd HX	179	int err;
716062fd HX	180	__be32 seq;
2cd08467	181	__be32 seq_hi;
3328715e	182	struct xfrm_state *x = NULL;
1bf06cd2	183	xfrm_address_t *daddr;
df9dcb45	184	struct xfrm_mode *inner_mode;
049f8e2e	185	u32 mark = skb->mark;
2fcb45b6	186	unsigned int family;
716062fd	187	int decaps = 0;
1bf06cd2 HX	188	int async = 0;
	189
	190	/* A negative encap_type indicates async resumption. */
	191	if (encap_type < 0) {
	192	async = 1;
00501121	193	x = xfrm_input_state(skb);
1ce3644a	194	seq = XFRM_SKB_CB(skb)->seq.input.low;
3328715e	195	family = x->outer_mode->afinfo->family;
1bf06cd2 HX	196	goto resume;
1bf06cd2 HX	197	}
716062fd	198
3328715e SK	199	daddr = (xfrm_address_t *)(skb_network_header(skb) +
	200	XFRM_SPI_SKB_CB(skb)->daddroff);
	201	family = XFRM_SPI_SKB_CB(skb)->family;
	202
049f8e2e	203	/* if tunnel is present override skb->mark value with tunnel i_key */
1625f452 AK	204	switch (family) {
	205	case AF_INET:
	206	if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
049f8e2e	207	mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4->parms.i_key);
1625f452 AK	208	break;
	209	case AF_INET6:
	210	if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
049f8e2e	211	mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6->parms.i_key);
1625f452	212	break;
049f8e2e AD	213	}
049f8e2e AD	214
b2aa5e9d HX	215	/* Allocate new secpath or COW existing one. */
	216	if (!skb->sp \|\| atomic_read(&skb->sp->refcnt) != 1) {
	217	struct sec_path *sp;
	218
	219	sp = secpath_dup(skb->sp);
0aa64774	220	if (!sp) {
59c9940e	221	XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
b2aa5e9d	222	goto drop;
0aa64774	223	}
b2aa5e9d HX	224	if (skb->sp)
	225	secpath_put(skb->sp);
	226	skb->sp = sp;
	227	}
	228
716062fd	229	seq = 0;
0aa64774	230	if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) {
59c9940e	231	XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
716062fd	232	goto drop;
0aa64774	233	}
716062fd HX	234
716062fd HX	235	do {
0aa64774	236	if (skb->sp->len == XFRM_MAX_DEPTH) {
59c9940e	237	XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
716062fd	238	goto drop;
0aa64774	239	}
716062fd	240
049f8e2e	241	x = xfrm_state_lookup(net, mark, daddr, spi, nexthdr, family);
0aa64774	242	if (x == NULL) {
59c9940e	243	XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES);
afeb14b4	244	xfrm_audit_state_notfound(skb, family, spi, seq);
716062fd	245	goto drop;
0aa64774	246	}
716062fd	247
b2aa5e9d HX	248	skb->sp->xvec[skb->sp->len++] = x;
b2aa5e9d HX	249
716062fd	250	spin_lock(&x->lock);
4c4d41f2	251
0aa64774	252	if (unlikely(x->km.state != XFRM_STATE_VALID)) {
dc0565ce LR	253	if (x->km.state == XFRM_STATE_ACQ)
	254	XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
	255	else
	256	XFRM_INC_STATS(net,
	257	LINUX_MIB_XFRMINSTATEINVALID);
716062fd	258	goto drop_unlock;
0aa64774	259	}
716062fd	260
3de77cf2 DM	261	if ((x->encap ? x->encap->encap_type : 0) != encap_type) {
	262	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
	263	goto drop_unlock;
	264	}
	265
36ae0148	266	if (x->repl->check(x, skb, seq)) {
59c9940e	267	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
716062fd	268	goto drop_unlock;
0aa64774	269	}
716062fd	270
0aa64774	271	if (xfrm_state_check_expire(x)) {
59c9940e	272	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED);
716062fd	273	goto drop_unlock;
0aa64774	274	}
716062fd	275
0ebea8ef HX	276	spin_unlock(&x->lock);
0ebea8ef HX	277
68c11e98 AD	278	if (xfrm_tunnel_check(skb, x, family)) {
	279	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
	280	goto drop;
	281	}
	282
2cd08467 SK	283	seq_hi = htonl(xfrm_replay_seqhi(x, seq));
2cd08467 SK	284
1ce3644a	285	XFRM_SKB_CB(skb)->seq.input.low = seq;
2cd08467	286	XFRM_SKB_CB(skb)->seq.input.hi = seq_hi;
1bf06cd2	287
3bc07321	288	skb_dst_force(skb);
071d36bf	289	dev_hold(skb->dev);
3bc07321	290
716062fd	291	nexthdr = x->type->input(x, skb);
0ebea8ef	292
1bf06cd2 HX	293	if (nexthdr == -EINPROGRESS)
1bf06cd2 HX	294	return 0;
1bf06cd2	295	resume:
071d36bf SAK	296	dev_put(skb->dev);
071d36bf SAK	297
0ebea8ef	298	spin_lock(&x->lock);
668dc8af	299	if (nexthdr <= 0) {
9dd3245a HX	300	if (nexthdr == -EBADMSG) {
	301	xfrm_audit_state_icvfail(x, skb,
	302	x->type->proto);
668dc8af	303	x->stats.integrity_failed++;
9dd3245a	304	}
59c9940e	305	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
716062fd	306	goto drop_unlock;
668dc8af	307	}
716062fd	308
716062fd HX	309	/* only the first xfrm gets the encap type */
	310	encap_type = 0;
	311
3b59df46	312	if (async && x->repl->recheck(x, skb, seq)) {
bcf66bf5 SK	313	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
	314	goto drop_unlock;
	315	}
	316
9fdc4883	317	x->repl->advance(x, seq);
716062fd HX	318
	319	x->curlft.bytes += skb->len;
	320	x->curlft.packets++;
	321
	322	spin_unlock(&x->lock);
	323
60d5fcfb HX	324	XFRM_MODE_SKB_CB(skb)->protocol = nexthdr;
60d5fcfb HX	325
df9dcb45 KM	326	inner_mode = x->inner_mode;
	327
	328	if (x->sel.family == AF_UNSPEC) {
	329	inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
cb866e32 SK	330	if (inner_mode == NULL) {
cb866e32 SK	331	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
df9dcb45	332	goto drop;
cb866e32	333	}
df9dcb45 KM	334	}
	335
	336	if (inner_mode->input(x, skb)) {
59c9940e	337	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
716062fd	338	goto drop;
0aa64774	339	}
716062fd HX	340
	341	if (x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) {
	342	decaps = 1;
	343	break;
	344	}
	345
1bf06cd2 HX	346	/*
	347	* We need the inner address. However, we only get here for
	348	* transport mode so the outer address is identical.
	349	*/
	350	daddr = &x->id.daddr;
2fcb45b6	351	family = x->outer_mode->afinfo->family;
1bf06cd2	352
716062fd	353	err = xfrm_parse_spi(skb, nexthdr, &spi, &seq);
0aa64774	354	if (err < 0) {
59c9940e	355	XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
716062fd	356	goto drop;
0aa64774	357	}
716062fd HX	358	} while (!err);
716062fd HX	359
3328715e SK	360	err = xfrm_rcv_cb(skb, family, x->type->proto, 0);
	361	if (err)
	362	goto drop;
	363
716062fd HX	364	nf_reset(skb);
	365
	366	if (decaps) {
adf30907	367	skb_dst_drop(skb);
1995876a	368	gro_cells_receive(&gro_cells, skb);
716062fd HX	369	return 0;
716062fd HX	370	} else {
1bf06cd2	371	return x->inner_mode->afinfo->transport_finish(skb, async);
716062fd HX	372	}
	373
	374	drop_unlock:
	375	spin_unlock(&x->lock);
716062fd	376	drop:
3328715e	377	xfrm_rcv_cb(skb, family, x && x->type ? x->type->proto : nexthdr, -1);
716062fd HX	378	kfree_skb(skb);
	379	return 0;
	380	}
	381	EXPORT_SYMBOL(xfrm_input);
	382
1bf06cd2 HX	383	int xfrm_input_resume(struct sk_buff *skb, int nexthdr)
	384	{
	385	return xfrm_input(skb, nexthdr, 0, -1);
	386	}
	387	EXPORT_SYMBOL(xfrm_input_resume);
	388
1da177e4 LT	389	void __init xfrm_input_init(void)
1da177e4 LT	390	{
1995876a SK	391	int err;
	392
	393	init_dummy_netdev(&xfrm_napi_dev);
	394	err = gro_cells_init(&gro_cells, &xfrm_napi_dev);
	395	if (err)
	396	gro_cells.cells = NULL;
	397
1da177e4 LT	398	secpath_cachep = kmem_cache_create("secpath_cache",
1da177e4 LT	399	sizeof(struct sec_path),
e5d679f3	400	0, SLAB_HWCACHE_ALIGN\|SLAB_PANIC,
20c2df83	401	NULL);
1da177e4	402	}