[linux-2.6-block.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 __rcu *xfrm_input_afinfo[NPROTO];

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

	if (unlikely(afinfo == NULL))
		return -EINVAL;
	if (unlikely(afinfo->family >= NPROTO))
		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(struct xfrm_input_afinfo *afinfo)
{
	int err = 0;

	if (unlikely(afinfo == NULL))
		return -EINVAL;
	if (unlikely(afinfo->family >= NPROTO))
		return -EAFNOSUPPORT;
	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 struct xfrm_input_afinfo *xfrm_input_get_afinfo(unsigned int family)
{
	struct xfrm_input_afinfo *afinfo;

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

static void xfrm_input_put_afinfo(struct xfrm_input_afinfo *afinfo)
{
	rcu_read_unlock();
}

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

	if (!afinfo)
		return -EAFNOSUPPORT;

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

	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 */
	if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) {
		switch (family) {
		case AF_INET:
			mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4->parms.i_key);
			break;
		case AF_INET6:
			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);

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

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