[linux.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>

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 = -ENOBUFS;
	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;
	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;

	/* 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, skb->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;

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

		spin_lock(&x->lock);
		if (unlikely(x->km.state == XFRM_STATE_ACQ)) {
			XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
			goto drop_unlock;
		}

		if (unlikely(x->km.state != XFRM_STATE_VALID)) {
			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);

		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)
				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>
	15	#include <net/xfrm.h>
	16
e18b890b	17	static struct kmem_cache *secpath_cachep __read_mostly;
1da177e4	18
2f32b51b SK	19	static DEFINE_SPINLOCK(xfrm_input_afinfo_lock);
	20	static struct xfrm_input_afinfo __rcu *xfrm_input_afinfo[NPROTO];
	21
	22	int xfrm_input_register_afinfo(struct xfrm_input_afinfo *afinfo)
	23	{
	24	int err = 0;
	25
	26	if (unlikely(afinfo == NULL))
	27	return -EINVAL;
	28	if (unlikely(afinfo->family >= NPROTO))
	29	return -EAFNOSUPPORT;
	30	spin_lock_bh(&xfrm_input_afinfo_lock);
	31	if (unlikely(xfrm_input_afinfo[afinfo->family] != NULL))
	32	err = -ENOBUFS;
	33	else
	34	rcu_assign_pointer(xfrm_input_afinfo[afinfo->family], afinfo);
	35	spin_unlock_bh(&xfrm_input_afinfo_lock);
	36	return err;
	37	}
	38	EXPORT_SYMBOL(xfrm_input_register_afinfo);
	39
	40	int xfrm_input_unregister_afinfo(struct xfrm_input_afinfo *afinfo)
	41	{
	42	int err = 0;
	43
	44	if (unlikely(afinfo == NULL))
	45	return -EINVAL;
	46	if (unlikely(afinfo->family >= NPROTO))
	47	return -EAFNOSUPPORT;
	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
	61	static struct xfrm_input_afinfo *xfrm_input_get_afinfo(unsigned int family)
	62	{
	63	struct xfrm_input_afinfo *afinfo;
	64
	65	if (unlikely(family >= NPROTO))
	66	return NULL;
	67	rcu_read_lock();
	68	afinfo = rcu_dereference(xfrm_input_afinfo[family]);
	69	if (unlikely(!afinfo))
	70	rcu_read_unlock();
	71	return afinfo;
	72	}
	73
	74	static void xfrm_input_put_afinfo(struct xfrm_input_afinfo *afinfo)
	75	{
	76	rcu_read_unlock();
	77	}
	78
	79	static int xfrm_rcv_cb(struct sk_buff *skb, unsigned int family, u8 protocol,
	80	int err)
	81	{
	82	int ret;
83	struct xfrm_input_afinfo *afinfo = xfrm_input_get_afinfo(family);
84
85	if (!afinfo)
86	return -EAFNOSUPPORT;
87
88	ret = afinfo->callback(skb, protocol, err);
89	xfrm_input_put_afinfo(afinfo);
90
91	return ret;
92	}
93
1da177e4 LT	94	void __secpath_destroy(struct sec_path *sp)
	95	{
	96	int i;
	97	for (i = 0; i < sp->len; i++)
dbe5b4aa	98	xfrm_state_put(sp->xvec[i]);
1da177e4 LT	99	kmem_cache_free(secpath_cachep, sp);
	100	}
	101	EXPORT_SYMBOL(__secpath_destroy);
	102
	103	struct sec_path secpath_dup(struct sec_path src)
	104	{
	105	struct sec_path *sp;
	106
54e6ecb2	107	sp = kmem_cache_alloc(secpath_cachep, GFP_ATOMIC);
1da177e4 LT	108	if (!sp)
	109	return NULL;
	110
	111	sp->len = 0;
	112	if (src) {
	113	int i;
	114
	115	memcpy(sp, src, sizeof(*sp));
	116	for (i = 0; i < sp->len; i++)
dbe5b4aa	117	xfrm_state_hold(sp->xvec[i]);
1da177e4 LT	118	}
	119	atomic_set(&sp->refcnt, 1);
	120	return sp;
	121	}
	122	EXPORT_SYMBOL(secpath_dup);
	123
	124	/* Fetch spi and seq from ipsec header */
	125
6067b2ba	126	int xfrm_parse_spi(struct sk_buff skb, u8 nexthdr, __be32 spi, __be32 *seq)
1da177e4 LT	127	{
1da177e4 LT	128	int offset, offset_seq;
44072500	129	int hlen;
1da177e4 LT	130
	131	switch (nexthdr) {
	132	case IPPROTO_AH:
44072500	133	hlen = sizeof(struct ip_auth_hdr);
1da177e4 LT	134	offset = offsetof(struct ip_auth_hdr, spi);
	135	offset_seq = offsetof(struct ip_auth_hdr, seq_no);
	136	break;
	137	case IPPROTO_ESP:
44072500	138	hlen = sizeof(struct ip_esp_hdr);
1da177e4 LT	139	offset = offsetof(struct ip_esp_hdr, spi);
	140	offset_seq = offsetof(struct ip_esp_hdr, seq_no);
	141	break;
	142	case IPPROTO_COMP:
	143	if (!pskb_may_pull(skb, sizeof(struct ip_comp_hdr)))
	144	return -EINVAL;
3e94c2dc	145	spi = htonl(ntohs((__be16 *)(skb_transport_header(skb) + 2)));
1da177e4 LT	146	*seq = 0;
	147	return 0;
	148	default:
	149	return 1;
	150	}
	151
44072500	152	if (!pskb_may_pull(skb, hlen))
1da177e4 LT	153	return -EINVAL;
1da177e4 LT	154
3e94c2dc WC	155	spi = (__be32 *)(skb_transport_header(skb) + offset);
3e94c2dc WC	156	seq = (__be32 *)(skb_transport_header(skb) + offset_seq);
1da177e4 LT	157	return 0;
1da177e4 LT	158	}
1da177e4	159
227620e2 HX	160	int xfrm_prepare_input(struct xfrm_state x, struct sk_buff skb)
227620e2 HX	161	{
df9dcb45	162	struct xfrm_mode *inner_mode = x->inner_mode;
227620e2 HX	163	int err;
	164
	165	err = x->outer_mode->afinfo->extract_input(x, skb);
	166	if (err)
	167	return err;
	168
df9dcb45 KM	169	if (x->sel.family == AF_UNSPEC) {
	170	inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
	171	if (inner_mode == NULL)
	172	return -EAFNOSUPPORT;
	173	}
	174
	175	skb->protocol = inner_mode->afinfo->eth_proto;
	176	return inner_mode->input2(x, skb);
227620e2 HX	177	}
	178	EXPORT_SYMBOL(xfrm_prepare_input);
	179
716062fd HX	180	int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
716062fd HX	181	{
bd235e3c	182	struct net *net = dev_net(skb->dev);
716062fd HX	183	int err;
716062fd HX	184	__be32 seq;
2cd08467	185	__be32 seq_hi;
3328715e	186	struct xfrm_state *x = NULL;
1bf06cd2	187	xfrm_address_t *daddr;
df9dcb45	188	struct xfrm_mode *inner_mode;
2fcb45b6	189	unsigned int family;
716062fd	190	int decaps = 0;
1bf06cd2 HX	191	int async = 0;
	192
	193	/* A negative encap_type indicates async resumption. */
	194	if (encap_type < 0) {
	195	async = 1;
00501121	196	x = xfrm_input_state(skb);
1ce3644a	197	seq = XFRM_SKB_CB(skb)->seq.input.low;
3328715e	198	family = x->outer_mode->afinfo->family;
1bf06cd2 HX	199	goto resume;
1bf06cd2 HX	200	}
716062fd	201
3328715e SK	202	daddr = (xfrm_address_t *)(skb_network_header(skb) +
	203	XFRM_SPI_SKB_CB(skb)->daddroff);
	204	family = XFRM_SPI_SKB_CB(skb)->family;
	205
b2aa5e9d HX	206	/* Allocate new secpath or COW existing one. */
	207	if (!skb->sp \|\| atomic_read(&skb->sp->refcnt) != 1) {
	208	struct sec_path *sp;
	209
	210	sp = secpath_dup(skb->sp);
0aa64774	211	if (!sp) {
59c9940e	212	XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
b2aa5e9d	213	goto drop;
0aa64774	214	}
b2aa5e9d HX	215	if (skb->sp)
	216	secpath_put(skb->sp);
	217	skb->sp = sp;
	218	}
	219
716062fd	220	seq = 0;
0aa64774	221	if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) {
59c9940e	222	XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
716062fd	223	goto drop;
0aa64774	224	}
716062fd HX	225
716062fd HX	226	do {
0aa64774	227	if (skb->sp->len == XFRM_MAX_DEPTH) {
59c9940e	228	XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
716062fd	229	goto drop;
0aa64774	230	}
716062fd	231
bd55775c	232	x = xfrm_state_lookup(net, skb->mark, daddr, spi, nexthdr, family);
0aa64774	233	if (x == NULL) {
59c9940e	234	XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES);
afeb14b4	235	xfrm_audit_state_notfound(skb, family, spi, seq);
716062fd	236	goto drop;
0aa64774	237	}
716062fd	238
b2aa5e9d HX	239	skb->sp->xvec[skb->sp->len++] = x;
b2aa5e9d HX	240
70be6c91 SK	241	if (xfrm_tunnel_check(skb, x, family)) {
	242	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
	243	goto drop;
	244	}
	245
716062fd	246	spin_lock(&x->lock);
4c4d41f2 FD	247	if (unlikely(x->km.state == XFRM_STATE_ACQ)) {
	248	XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
	249	goto drop_unlock;
	250	}
	251
0aa64774	252	if (unlikely(x->km.state != XFRM_STATE_VALID)) {
59c9940e	253	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEINVALID);
716062fd	254	goto drop_unlock;
0aa64774	255	}
716062fd	256
3de77cf2 DM	257	if ((x->encap ? x->encap->encap_type : 0) != encap_type) {
	258	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
	259	goto drop_unlock;
	260	}
	261
36ae0148	262	if (x->repl->check(x, skb, seq)) {
59c9940e	263	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
716062fd	264	goto drop_unlock;
0aa64774	265	}
716062fd	266
0aa64774	267	if (xfrm_state_check_expire(x)) {
59c9940e	268	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED);
716062fd	269	goto drop_unlock;
0aa64774	270	}
716062fd	271
0ebea8ef HX	272	spin_unlock(&x->lock);
0ebea8ef HX	273
2cd08467 SK	274	seq_hi = htonl(xfrm_replay_seqhi(x, seq));
2cd08467 SK	275
1ce3644a	276	XFRM_SKB_CB(skb)->seq.input.low = seq;
2cd08467	277	XFRM_SKB_CB(skb)->seq.input.hi = seq_hi;
1bf06cd2	278
3bc07321 SK	279	skb_dst_force(skb);
3bc07321 SK	280
716062fd	281	nexthdr = x->type->input(x, skb);
0ebea8ef	282
1bf06cd2 HX	283	if (nexthdr == -EINPROGRESS)
1bf06cd2 HX	284	return 0;
1bf06cd2	285	resume:
0ebea8ef	286	spin_lock(&x->lock);
668dc8af	287	if (nexthdr <= 0) {
9dd3245a HX	288	if (nexthdr == -EBADMSG) {
	289	xfrm_audit_state_icvfail(x, skb,
	290	x->type->proto);
668dc8af	291	x->stats.integrity_failed++;
9dd3245a	292	}
59c9940e	293	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
716062fd	294	goto drop_unlock;
668dc8af	295	}
716062fd	296
716062fd HX	297	/* only the first xfrm gets the encap type */
	298	encap_type = 0;
	299
3b59df46	300	if (async && x->repl->recheck(x, skb, seq)) {
bcf66bf5 SK	301	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
	302	goto drop_unlock;
	303	}
	304
9fdc4883	305	x->repl->advance(x, seq);
716062fd HX	306
	307	x->curlft.bytes += skb->len;
	308	x->curlft.packets++;
	309
	310	spin_unlock(&x->lock);
	311
60d5fcfb HX	312	XFRM_MODE_SKB_CB(skb)->protocol = nexthdr;
60d5fcfb HX	313
df9dcb45 KM	314	inner_mode = x->inner_mode;
	315
	316	if (x->sel.family == AF_UNSPEC) {
	317	inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
	318	if (inner_mode == NULL)
	319	goto drop;
	320	}
	321
	322	if (inner_mode->input(x, skb)) {
59c9940e	323	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
716062fd	324	goto drop;
0aa64774	325	}
716062fd HX	326
	327	if (x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) {
	328	decaps = 1;
	329	break;
	330	}
	331
1bf06cd2 HX	332	/*
	333	* We need the inner address. However, we only get here for
	334	* transport mode so the outer address is identical.
	335	*/
	336	daddr = &x->id.daddr;
2fcb45b6	337	family = x->outer_mode->afinfo->family;
1bf06cd2	338
716062fd	339	err = xfrm_parse_spi(skb, nexthdr, &spi, &seq);
0aa64774	340	if (err < 0) {
59c9940e	341	XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
716062fd	342	goto drop;
0aa64774	343	}
716062fd HX	344	} while (!err);
716062fd HX	345
3328715e SK	346	err = xfrm_rcv_cb(skb, family, x->type->proto, 0);
	347	if (err)
	348	goto drop;
	349
716062fd HX	350	nf_reset(skb);
	351
	352	if (decaps) {
adf30907	353	skb_dst_drop(skb);
716062fd HX	354	netif_rx(skb);
	355	return 0;
	356	} else {
1bf06cd2	357	return x->inner_mode->afinfo->transport_finish(skb, async);
716062fd HX	358	}
	359
	360	drop_unlock:
	361	spin_unlock(&x->lock);
716062fd	362	drop:
3328715e	363	xfrm_rcv_cb(skb, family, x && x->type ? x->type->proto : nexthdr, -1);
716062fd HX	364	kfree_skb(skb);
	365	return 0;
	366	}
	367	EXPORT_SYMBOL(xfrm_input);
	368
1bf06cd2 HX	369	int xfrm_input_resume(struct sk_buff *skb, int nexthdr)
	370	{
	371	return xfrm_input(skb, nexthdr, 0, -1);
	372	}
	373	EXPORT_SYMBOL(xfrm_input_resume);
	374
1da177e4 LT	375	void __init xfrm_input_init(void)
	376	{
	377	secpath_cachep = kmem_cache_create("secpath_cache",
	378	sizeof(struct sec_path),
e5d679f3	379	0, SLAB_HWCACHE_ALIGN\|SLAB_PANIC,
20c2df83	380	NULL);
1da177e4	381	}