[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;
	sp->olen = 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);

int secpath_set(struct sk_buff *skb)
{
	struct sec_path *sp;

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

		if (skb->sp)
			secpath_put(skb->sp);
		skb->sp = sp;
	}
	return 0;
}
EXPORT_SYMBOL(secpath_set);

/* 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;
}
EXPORT_SYMBOL(xfrm_parse_spi);

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;
	}

	err = secpath_set(skb);
	if (err) {
		XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
		goto drop;
	}

	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;
54ef207a SK	108	sp->olen = 0;
54ef207a SK	109
1da177e4 LT	110	if (src) {
	111	int i;
	112
	113	memcpy(sp, src, sizeof(*sp));
	114	for (i = 0; i < sp->len; i++)
dbe5b4aa	115	xfrm_state_hold(sp->xvec[i]);
1da177e4 LT	116	}
	117	atomic_set(&sp->refcnt, 1);
	118	return sp;
	119	}
	120	EXPORT_SYMBOL(secpath_dup);
	121
b0fcee82 SK	122	int secpath_set(struct sk_buff *skb)
	123	{
	124	struct sec_path *sp;
	125
	126	/* Allocate new secpath or COW existing one. */
	127	if (!skb->sp \|\| atomic_read(&skb->sp->refcnt) != 1) {
	128	sp = secpath_dup(skb->sp);
	129	if (!sp)
	130	return -ENOMEM;
	131
	132	if (skb->sp)
	133	secpath_put(skb->sp);
	134	skb->sp = sp;
	135	}
	136	return 0;
	137	}
	138	EXPORT_SYMBOL(secpath_set);
	139
1da177e4 LT	140	/* Fetch spi and seq from ipsec header */
1da177e4 LT	141
6067b2ba	142	int xfrm_parse_spi(struct sk_buff skb, u8 nexthdr, __be32 spi, __be32 *seq)
1da177e4 LT	143	{
1da177e4 LT	144	int offset, offset_seq;
44072500	145	int hlen;
1da177e4 LT	146
	147	switch (nexthdr) {
	148	case IPPROTO_AH:
44072500	149	hlen = sizeof(struct ip_auth_hdr);
1da177e4 LT	150	offset = offsetof(struct ip_auth_hdr, spi);
	151	offset_seq = offsetof(struct ip_auth_hdr, seq_no);
	152	break;
	153	case IPPROTO_ESP:
44072500	154	hlen = sizeof(struct ip_esp_hdr);
1da177e4 LT	155	offset = offsetof(struct ip_esp_hdr, spi);
	156	offset_seq = offsetof(struct ip_esp_hdr, seq_no);
	157	break;
	158	case IPPROTO_COMP:
	159	if (!pskb_may_pull(skb, sizeof(struct ip_comp_hdr)))
	160	return -EINVAL;
3e94c2dc	161	spi = htonl(ntohs((__be16 *)(skb_transport_header(skb) + 2)));
1da177e4 LT	162	*seq = 0;
	163	return 0;
	164	default:
	165	return 1;
	166	}
	167
44072500	168	if (!pskb_may_pull(skb, hlen))
1da177e4 LT	169	return -EINVAL;
1da177e4 LT	170
3e94c2dc WC	171	spi = (__be32 *)(skb_transport_header(skb) + offset);
3e94c2dc WC	172	seq = (__be32 *)(skb_transport_header(skb) + offset_seq);
1da177e4 LT	173	return 0;
1da177e4 LT	174	}
1e295370	175	EXPORT_SYMBOL(xfrm_parse_spi);
1da177e4	176
227620e2 HX	177	int xfrm_prepare_input(struct xfrm_state x, struct sk_buff skb)
227620e2 HX	178	{
df9dcb45	179	struct xfrm_mode *inner_mode = x->inner_mode;
227620e2 HX	180	int err;
	181
	182	err = x->outer_mode->afinfo->extract_input(x, skb);
	183	if (err)
	184	return err;
	185
df9dcb45 KM	186	if (x->sel.family == AF_UNSPEC) {
	187	inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
	188	if (inner_mode == NULL)
	189	return -EAFNOSUPPORT;
	190	}
	191
	192	skb->protocol = inner_mode->afinfo->eth_proto;
	193	return inner_mode->input2(x, skb);
227620e2 HX	194	}
	195	EXPORT_SYMBOL(xfrm_prepare_input);
	196
716062fd HX	197	int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
716062fd HX	198	{
bd235e3c	199	struct net *net = dev_net(skb->dev);
716062fd HX	200	int err;
716062fd HX	201	__be32 seq;
2cd08467	202	__be32 seq_hi;
3328715e	203	struct xfrm_state *x = NULL;
1bf06cd2	204	xfrm_address_t *daddr;
df9dcb45	205	struct xfrm_mode *inner_mode;
049f8e2e	206	u32 mark = skb->mark;
2fcb45b6	207	unsigned int family;
716062fd	208	int decaps = 0;
1bf06cd2 HX	209	int async = 0;
	210
	211	/* A negative encap_type indicates async resumption. */
	212	if (encap_type < 0) {
	213	async = 1;
00501121	214	x = xfrm_input_state(skb);
1ce3644a	215	seq = XFRM_SKB_CB(skb)->seq.input.low;
3328715e	216	family = x->outer_mode->afinfo->family;
1bf06cd2 HX	217	goto resume;
1bf06cd2 HX	218	}
716062fd	219
3328715e SK	220	daddr = (xfrm_address_t *)(skb_network_header(skb) +
	221	XFRM_SPI_SKB_CB(skb)->daddroff);
	222	family = XFRM_SPI_SKB_CB(skb)->family;
	223
049f8e2e	224	/* if tunnel is present override skb->mark value with tunnel i_key */
1625f452 AK	225	switch (family) {
	226	case AF_INET:
	227	if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
049f8e2e	228	mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4->parms.i_key);
1625f452 AK	229	break;
	230	case AF_INET6:
	231	if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
049f8e2e	232	mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6->parms.i_key);
1625f452	233	break;
049f8e2e AD	234	}
049f8e2e AD	235
b0fcee82 SK	236	err = secpath_set(skb);
	237	if (err) {
	238	XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
	239	goto drop;
b2aa5e9d HX	240	}
b2aa5e9d HX	241
716062fd	242	seq = 0;
0aa64774	243	if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) {
59c9940e	244	XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
716062fd	245	goto drop;
0aa64774	246	}
716062fd HX	247
716062fd HX	248	do {
0aa64774	249	if (skb->sp->len == XFRM_MAX_DEPTH) {
59c9940e	250	XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
716062fd	251	goto drop;
0aa64774	252	}
716062fd	253
049f8e2e	254	x = xfrm_state_lookup(net, mark, daddr, spi, nexthdr, family);
0aa64774	255	if (x == NULL) {
59c9940e	256	XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES);
afeb14b4	257	xfrm_audit_state_notfound(skb, family, spi, seq);
716062fd	258	goto drop;
0aa64774	259	}
716062fd	260
b2aa5e9d HX	261	skb->sp->xvec[skb->sp->len++] = x;
b2aa5e9d HX	262
716062fd	263	spin_lock(&x->lock);
4c4d41f2	264
0aa64774	265	if (unlikely(x->km.state != XFRM_STATE_VALID)) {
dc0565ce LR	266	if (x->km.state == XFRM_STATE_ACQ)
	267	XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
	268	else
	269	XFRM_INC_STATS(net,
	270	LINUX_MIB_XFRMINSTATEINVALID);
716062fd	271	goto drop_unlock;
0aa64774	272	}
716062fd	273
3de77cf2 DM	274	if ((x->encap ? x->encap->encap_type : 0) != encap_type) {
	275	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
	276	goto drop_unlock;
	277	}
	278
36ae0148	279	if (x->repl->check(x, skb, seq)) {
59c9940e	280	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
716062fd	281	goto drop_unlock;
0aa64774	282	}
716062fd	283
0aa64774	284	if (xfrm_state_check_expire(x)) {
59c9940e	285	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED);
716062fd	286	goto drop_unlock;
0aa64774	287	}
716062fd	288
0ebea8ef HX	289	spin_unlock(&x->lock);
0ebea8ef HX	290
68c11e98 AD	291	if (xfrm_tunnel_check(skb, x, family)) {
	292	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
	293	goto drop;
	294	}
	295
2cd08467 SK	296	seq_hi = htonl(xfrm_replay_seqhi(x, seq));
2cd08467 SK	297
1ce3644a	298	XFRM_SKB_CB(skb)->seq.input.low = seq;
2cd08467	299	XFRM_SKB_CB(skb)->seq.input.hi = seq_hi;
1bf06cd2	300
3bc07321	301	skb_dst_force(skb);
071d36bf	302	dev_hold(skb->dev);
3bc07321	303
716062fd	304	nexthdr = x->type->input(x, skb);
0ebea8ef	305
1bf06cd2 HX	306	if (nexthdr == -EINPROGRESS)
1bf06cd2 HX	307	return 0;
1bf06cd2	308	resume:
071d36bf SAK	309	dev_put(skb->dev);
071d36bf SAK	310
0ebea8ef	311	spin_lock(&x->lock);
668dc8af	312	if (nexthdr <= 0) {
9dd3245a HX	313	if (nexthdr == -EBADMSG) {
	314	xfrm_audit_state_icvfail(x, skb,
	315	x->type->proto);
668dc8af	316	x->stats.integrity_failed++;
9dd3245a	317	}
59c9940e	318	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
716062fd	319	goto drop_unlock;
668dc8af	320	}
716062fd	321
716062fd HX	322	/* only the first xfrm gets the encap type */
	323	encap_type = 0;
	324
3b59df46	325	if (async && x->repl->recheck(x, skb, seq)) {
bcf66bf5 SK	326	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
	327	goto drop_unlock;
	328	}
	329
9fdc4883	330	x->repl->advance(x, seq);
716062fd HX	331
	332	x->curlft.bytes += skb->len;
	333	x->curlft.packets++;
	334
	335	spin_unlock(&x->lock);
	336
60d5fcfb HX	337	XFRM_MODE_SKB_CB(skb)->protocol = nexthdr;
60d5fcfb HX	338
df9dcb45 KM	339	inner_mode = x->inner_mode;
	340
	341	if (x->sel.family == AF_UNSPEC) {
	342	inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
cb866e32 SK	343	if (inner_mode == NULL) {
cb866e32 SK	344	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
df9dcb45	345	goto drop;
cb866e32	346	}
df9dcb45 KM	347	}
	348
	349	if (inner_mode->input(x, skb)) {
59c9940e	350	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
716062fd	351	goto drop;
0aa64774	352	}
716062fd HX	353
	354	if (x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) {
	355	decaps = 1;
	356	break;
	357	}
	358
1bf06cd2 HX	359	/*
	360	* We need the inner address. However, we only get here for
	361	* transport mode so the outer address is identical.
	362	*/
	363	daddr = &x->id.daddr;
2fcb45b6	364	family = x->outer_mode->afinfo->family;
1bf06cd2	365
716062fd	366	err = xfrm_parse_spi(skb, nexthdr, &spi, &seq);
0aa64774	367	if (err < 0) {
59c9940e	368	XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
716062fd	369	goto drop;
0aa64774	370	}
716062fd HX	371	} while (!err);
716062fd HX	372
3328715e SK	373	err = xfrm_rcv_cb(skb, family, x->type->proto, 0);
	374	if (err)
	375	goto drop;
	376
716062fd HX	377	nf_reset(skb);
	378
	379	if (decaps) {
adf30907	380	skb_dst_drop(skb);
1995876a	381	gro_cells_receive(&gro_cells, skb);
716062fd HX	382	return 0;
716062fd HX	383	} else {
1bf06cd2	384	return x->inner_mode->afinfo->transport_finish(skb, async);
716062fd HX	385	}
	386
	387	drop_unlock:
	388	spin_unlock(&x->lock);
716062fd	389	drop:
3328715e	390	xfrm_rcv_cb(skb, family, x && x->type ? x->type->proto : nexthdr, -1);
716062fd HX	391	kfree_skb(skb);
	392	return 0;
	393	}
	394	EXPORT_SYMBOL(xfrm_input);
	395
1bf06cd2 HX	396	int xfrm_input_resume(struct sk_buff *skb, int nexthdr)
	397	{
	398	return xfrm_input(skb, nexthdr, 0, -1);
	399	}
	400	EXPORT_SYMBOL(xfrm_input_resume);
	401
1da177e4 LT	402	void __init xfrm_input_init(void)
1da177e4 LT	403	{
1995876a SK	404	int err;
	405
	406	init_dummy_netdev(&xfrm_napi_dev);
	407	err = gro_cells_init(&gro_cells, &xfrm_napi_dev);
	408	if (err)
	409	gro_cells.cells = NULL;
	410
1da177e4 LT	411	secpath_cachep = kmem_cache_create("secpath_cache",
1da177e4 LT	412	sizeof(struct sec_path),
e5d679f3	413	0, SLAB_HWCACHE_ALIGN\|SLAB_PANIC,
20c2df83	414	NULL);
1da177e4	415	}