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

// SPDX-License-Identifier: GPL-2.0
/*
 * 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;

	memset(sp->ovec, 0, sizeof(sp->ovec[XFRM_MAX_OFFLOAD_DEPTH]));

	if (src) {
		int i;

		memcpy(sp, src, sizeof(*sp));
		for (i = 0; i < sp->len; i++)
			xfrm_state_hold(sp->xvec[i]);
	}
	refcount_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 || refcount_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;
	bool xfrm_gro = false;
	bool crypto_done = false;
	struct xfrm_offload *xo = xfrm_offload(skb);

	if (encap_type < 0) {
		x = xfrm_input_state(skb);
		family = x->outer_mode->afinfo->family;

		/* An encap_type of -1 indicates async resumption. */
		if (encap_type == -1) {
			async = 1;
			seq = XFRM_SKB_CB(skb)->seq.input.low;
			goto resume;
		}

		/* encap_type < -1 indicates a GRO call. */
		encap_type = 0;
		seq = XFRM_SPI_SKB_CB(skb)->seq;

		if (xo && (xo->flags & CRYPTO_DONE)) {
			crypto_done = true;
			x = xfrm_input_state(skb);
			family = XFRM_SPI_SKB_CB(skb)->family;

			if (!(xo->status & CRYPTO_SUCCESS)) {
				if (xo->status &
				    (CRYPTO_TRANSPORT_AH_AUTH_FAILED |
				     CRYPTO_TRANSPORT_ESP_AUTH_FAILED |
				     CRYPTO_TUNNEL_AH_AUTH_FAILED |
				     CRYPTO_TUNNEL_ESP_AUTH_FAILED)) {

					xfrm_audit_state_icvfail(x, skb,
								 x->type->proto);
					x->stats.integrity_failed++;
					XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
					goto drop;
				}

				if (xo->status & CRYPTO_INVALID_PROTOCOL) {
					XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
					goto drop;
				}

				XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
				goto drop;
			}

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

		goto lock;
	}

	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;

lock:
		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);

		if (crypto_done)
			nexthdr = x->type_offload->input_tail(x, skb);
		else
			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) {
		if (skb->sp)
			skb->sp->olen = 0;
		skb_dst_drop(skb);
		gro_cells_receive(&gro_cells, skb);
		return 0;
	} else {
		xo = xfrm_offload(skb);
		if (xo)
			xfrm_gro = xo->flags & XFRM_GRO;

		err = x->inner_mode->afinfo->transport_finish(skb, xfrm_gro || async);
		if (xfrm_gro) {
			if (skb->sp)
				skb->sp->olen = 0;
			skb_dst_drop(skb);
			gro_cells_receive(&gro_cells, skb);
			return err;
		}

		return err;
	}

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
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4 LT	2	/*
	3	* xfrm_input.c
	4	*
	5	* Changes:
	6	* YOSHIFUJI Hideaki @USAGI
	7	* Split up af-specific portion
a716c119	8	*
1da177e4 LT	9	*/
	10
	11	#include <linux/slab.h>
	12	#include <linux/module.h>
716062fd HX	13	#include <linux/netdevice.h>
716062fd HX	14	#include <net/dst.h>
1da177e4 LT	15	#include <net/ip.h>
1da177e4 LT	16	#include <net/xfrm.h>
049f8e2e AD	17	#include <net/ip_tunnels.h>
049f8e2e AD	18	#include <net/ip6_tunnel.h>
1da177e4	19
e18b890b	20	static struct kmem_cache *secpath_cachep __read_mostly;
1da177e4	21
2f32b51b	22	static DEFINE_SPINLOCK(xfrm_input_afinfo_lock);
960fdfde	23	static struct xfrm_input_afinfo const __rcu *xfrm_input_afinfo[AF_INET6 + 1];
2f32b51b	24
1995876a SK	25	static struct gro_cells gro_cells;
	26	static struct net_device xfrm_napi_dev;
	27
960fdfde	28	int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo)
2f32b51b SK	29	{
	30	int err = 0;
	31
960fdfde	32	if (WARN_ON(afinfo->family >= ARRAY_SIZE(xfrm_input_afinfo)))
2f32b51b	33	return -EAFNOSUPPORT;
960fdfde	34
2f32b51b SK	35	spin_lock_bh(&xfrm_input_afinfo_lock);
2f32b51b SK	36	if (unlikely(xfrm_input_afinfo[afinfo->family] != NULL))
f31e8d4f	37	err = -EEXIST;
2f32b51b SK	38	else
	39	rcu_assign_pointer(xfrm_input_afinfo[afinfo->family], afinfo);
	40	spin_unlock_bh(&xfrm_input_afinfo_lock);
	41	return err;
	42	}
	43	EXPORT_SYMBOL(xfrm_input_register_afinfo);
	44
960fdfde	45	int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo)
2f32b51b SK	46	{
	47	int err = 0;
	48
2f32b51b SK	49	spin_lock_bh(&xfrm_input_afinfo_lock);
	50	if (likely(xfrm_input_afinfo[afinfo->family] != NULL)) {
	51	if (unlikely(xfrm_input_afinfo[afinfo->family] != afinfo))
	52	err = -EINVAL;
	53	else
	54	RCU_INIT_POINTER(xfrm_input_afinfo[afinfo->family], NULL);
	55	}
	56	spin_unlock_bh(&xfrm_input_afinfo_lock);
	57	synchronize_rcu();
	58	return err;
	59	}
	60	EXPORT_SYMBOL(xfrm_input_unregister_afinfo);
	61
960fdfde	62	static const struct xfrm_input_afinfo *xfrm_input_get_afinfo(unsigned int family)
2f32b51b	63	{
960fdfde	64	const struct xfrm_input_afinfo *afinfo;
2f32b51b	65
960fdfde	66	if (WARN_ON_ONCE(family >= ARRAY_SIZE(xfrm_input_afinfo)))
2f32b51b	67	return NULL;
960fdfde	68
2f32b51b SK	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
2f32b51b SK	76	static int xfrm_rcv_cb(struct sk_buff *skb, unsigned int family, u8 protocol,
	77	int err)
	78	{
	79	int ret;
960fdfde	80	const struct xfrm_input_afinfo *afinfo = xfrm_input_get_afinfo(family);
2f32b51b SK	81
	82	if (!afinfo)
	83	return -EAFNOSUPPORT;
	84
	85	ret = afinfo->callback(skb, protocol, err);
960fdfde	86	rcu_read_unlock();
2f32b51b SK	87
	88	return ret;
	89	}
	90
1da177e4 LT	91	void __secpath_destroy(struct sec_path *sp)
	92	{
	93	int i;
	94	for (i = 0; i < sp->len; i++)
dbe5b4aa	95	xfrm_state_put(sp->xvec[i]);
1da177e4 LT	96	kmem_cache_free(secpath_cachep, sp);
	97	}
	98	EXPORT_SYMBOL(__secpath_destroy);
	99
	100	struct sec_path secpath_dup(struct sec_path src)
	101	{
	102	struct sec_path *sp;
	103
54e6ecb2	104	sp = kmem_cache_alloc(secpath_cachep, GFP_ATOMIC);
1da177e4 LT	105	if (!sp)
	106	return NULL;
	107
	108	sp->len = 0;
54ef207a SK	109	sp->olen = 0;
54ef207a SK	110
d77e38e6 SK	111	memset(sp->ovec, 0, sizeof(sp->ovec[XFRM_MAX_OFFLOAD_DEPTH]));
d77e38e6 SK	112
1da177e4 LT	113	if (src) {
	114	int i;
	115
	116	memcpy(sp, src, sizeof(*sp));
	117	for (i = 0; i < sp->len; i++)
dbe5b4aa	118	xfrm_state_hold(sp->xvec[i]);
1da177e4	119	}
55eabed6	120	refcount_set(&sp->refcnt, 1);
1da177e4 LT	121	return sp;
	122	}
	123	EXPORT_SYMBOL(secpath_dup);
	124
b0fcee82 SK	125	int secpath_set(struct sk_buff *skb)
	126	{
	127	struct sec_path *sp;
	128
	129	/* Allocate new secpath or COW existing one. */
55eabed6	130	if (!skb->sp \|\| refcount_read(&skb->sp->refcnt) != 1) {
b0fcee82 SK	131	sp = secpath_dup(skb->sp);
	132	if (!sp)
	133	return -ENOMEM;
	134
	135	if (skb->sp)
	136	secpath_put(skb->sp);
	137	skb->sp = sp;
	138	}
	139	return 0;
	140	}
	141	EXPORT_SYMBOL(secpath_set);
	142
1da177e4 LT	143	/* Fetch spi and seq from ipsec header */
1da177e4 LT	144
6067b2ba	145	int xfrm_parse_spi(struct sk_buff skb, u8 nexthdr, __be32 spi, __be32 *seq)
1da177e4 LT	146	{
1da177e4 LT	147	int offset, offset_seq;
44072500	148	int hlen;
1da177e4 LT	149
	150	switch (nexthdr) {
	151	case IPPROTO_AH:
44072500	152	hlen = sizeof(struct ip_auth_hdr);
1da177e4 LT	153	offset = offsetof(struct ip_auth_hdr, spi);
	154	offset_seq = offsetof(struct ip_auth_hdr, seq_no);
	155	break;
	156	case IPPROTO_ESP:
44072500	157	hlen = sizeof(struct ip_esp_hdr);
1da177e4 LT	158	offset = offsetof(struct ip_esp_hdr, spi);
	159	offset_seq = offsetof(struct ip_esp_hdr, seq_no);
	160	break;
	161	case IPPROTO_COMP:
	162	if (!pskb_may_pull(skb, sizeof(struct ip_comp_hdr)))
	163	return -EINVAL;
3e94c2dc	164	spi = htonl(ntohs((__be16 *)(skb_transport_header(skb) + 2)));
1da177e4 LT	165	*seq = 0;
	166	return 0;
	167	default:
	168	return 1;
	169	}
	170
44072500	171	if (!pskb_may_pull(skb, hlen))
1da177e4 LT	172	return -EINVAL;
1da177e4 LT	173
3e94c2dc WC	174	spi = (__be32 *)(skb_transport_header(skb) + offset);
3e94c2dc WC	175	seq = (__be32 *)(skb_transport_header(skb) + offset_seq);
1da177e4 LT	176	return 0;
1da177e4 LT	177	}
1e295370	178	EXPORT_SYMBOL(xfrm_parse_spi);
1da177e4	179
227620e2 HX	180	int xfrm_prepare_input(struct xfrm_state x, struct sk_buff skb)
227620e2 HX	181	{
df9dcb45	182	struct xfrm_mode *inner_mode = x->inner_mode;
227620e2 HX	183	int err;
	184
	185	err = x->outer_mode->afinfo->extract_input(x, skb);
	186	if (err)
	187	return err;
	188
df9dcb45 KM	189	if (x->sel.family == AF_UNSPEC) {
	190	inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
	191	if (inner_mode == NULL)
	192	return -EAFNOSUPPORT;
	193	}
	194
	195	skb->protocol = inner_mode->afinfo->eth_proto;
	196	return inner_mode->input2(x, skb);
227620e2 HX	197	}
	198	EXPORT_SYMBOL(xfrm_prepare_input);
	199
716062fd HX	200	int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
716062fd HX	201	{
bd235e3c	202	struct net *net = dev_net(skb->dev);
716062fd HX	203	int err;
716062fd HX	204	__be32 seq;
2cd08467	205	__be32 seq_hi;
3328715e	206	struct xfrm_state *x = NULL;
1bf06cd2	207	xfrm_address_t *daddr;
df9dcb45	208	struct xfrm_mode *inner_mode;
049f8e2e	209	u32 mark = skb->mark;
2fcb45b6	210	unsigned int family;
716062fd	211	int decaps = 0;
1bf06cd2	212	int async = 0;
7785bba2	213	bool xfrm_gro = false;
d77e38e6 SK	214	bool crypto_done = false;
d77e38e6 SK	215	struct xfrm_offload *xo = xfrm_offload(skb);
1bf06cd2	216
1bf06cd2	217	if (encap_type < 0) {
00501121	218	x = xfrm_input_state(skb);
3328715e	219	family = x->outer_mode->afinfo->family;
7785bba2 SK	220
	221	/* An encap_type of -1 indicates async resumption. */
	222	if (encap_type == -1) {
	223	async = 1;
	224	seq = XFRM_SKB_CB(skb)->seq.input.low;
	225	goto resume;
	226	}
bcd1f8a4	227
7785bba2 SK	228	/* encap_type < -1 indicates a GRO call. */
	229	encap_type = 0;
	230	seq = XFRM_SPI_SKB_CB(skb)->seq;
716062fd	231
bcd1f8a4 SK	232	if (xo && (xo->flags & CRYPTO_DONE)) {
	233	crypto_done = true;
	234	x = xfrm_input_state(skb);
	235	family = XFRM_SPI_SKB_CB(skb)->family;
	236
	237	if (!(xo->status & CRYPTO_SUCCESS)) {
	238	if (xo->status &
	239	(CRYPTO_TRANSPORT_AH_AUTH_FAILED \|
	240	CRYPTO_TRANSPORT_ESP_AUTH_FAILED \|
	241	CRYPTO_TUNNEL_AH_AUTH_FAILED \|
	242	CRYPTO_TUNNEL_ESP_AUTH_FAILED)) {
	243
	244	xfrm_audit_state_icvfail(x, skb,
	245	x->type->proto);
	246	x->stats.integrity_failed++;
	247	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
	248	goto drop;
	249	}
	250
47ebcc0b YK	251	if (xo->status & CRYPTO_INVALID_PROTOCOL) {
	252	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
	253	goto drop;
	254	}
	255
bcd1f8a4	256	XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
d77e38e6 SK	257	goto drop;
	258	}
	259
bcd1f8a4 SK	260	if ((err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) {
	261	XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
	262	goto drop;
	263	}
d77e38e6 SK	264	}
d77e38e6 SK	265
7785bba2	266	goto lock;
1bf06cd2	267	}
716062fd	268
3328715e SK	269	daddr = (xfrm_address_t *)(skb_network_header(skb) +
	270	XFRM_SPI_SKB_CB(skb)->daddroff);
	271	family = XFRM_SPI_SKB_CB(skb)->family;
	272
049f8e2e	273	/* if tunnel is present override skb->mark value with tunnel i_key */
1625f452 AK	274	switch (family) {
	275	case AF_INET:
	276	if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
049f8e2e	277	mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4->parms.i_key);
1625f452 AK	278	break;
	279	case AF_INET6:
	280	if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
049f8e2e	281	mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6->parms.i_key);
1625f452	282	break;
049f8e2e AD	283	}
049f8e2e AD	284
b0fcee82 SK	285	err = secpath_set(skb);
	286	if (err) {
	287	XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
	288	goto drop;
b2aa5e9d HX	289	}
b2aa5e9d HX	290
716062fd	291	seq = 0;
0aa64774	292	if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) {
59c9940e	293	XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
716062fd	294	goto drop;
0aa64774	295	}
716062fd HX	296
716062fd HX	297	do {
0aa64774	298	if (skb->sp->len == XFRM_MAX_DEPTH) {
59c9940e	299	XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
716062fd	300	goto drop;
0aa64774	301	}
716062fd	302
049f8e2e	303	x = xfrm_state_lookup(net, mark, daddr, spi, nexthdr, family);
0aa64774	304	if (x == NULL) {
59c9940e	305	XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES);
afeb14b4	306	xfrm_audit_state_notfound(skb, family, spi, seq);
716062fd	307	goto drop;
0aa64774	308	}
716062fd	309
b2aa5e9d HX	310	skb->sp->xvec[skb->sp->len++] = x;
b2aa5e9d HX	311
7785bba2	312	lock:
716062fd	313	spin_lock(&x->lock);
4c4d41f2	314
0aa64774	315	if (unlikely(x->km.state != XFRM_STATE_VALID)) {
dc0565ce LR	316	if (x->km.state == XFRM_STATE_ACQ)
	317	XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
	318	else
	319	XFRM_INC_STATS(net,
	320	LINUX_MIB_XFRMINSTATEINVALID);
716062fd	321	goto drop_unlock;
0aa64774	322	}
716062fd	323
3de77cf2 DM	324	if ((x->encap ? x->encap->encap_type : 0) != encap_type) {
	325	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
	326	goto drop_unlock;
	327	}
	328
36ae0148	329	if (x->repl->check(x, skb, seq)) {
59c9940e	330	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
716062fd	331	goto drop_unlock;
0aa64774	332	}
716062fd	333
0aa64774	334	if (xfrm_state_check_expire(x)) {
59c9940e	335	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED);
716062fd	336	goto drop_unlock;
0aa64774	337	}
716062fd	338
0ebea8ef HX	339	spin_unlock(&x->lock);
0ebea8ef HX	340
68c11e98 AD	341	if (xfrm_tunnel_check(skb, x, family)) {
	342	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
	343	goto drop;
	344	}
	345
2cd08467 SK	346	seq_hi = htonl(xfrm_replay_seqhi(x, seq));
2cd08467 SK	347
1ce3644a	348	XFRM_SKB_CB(skb)->seq.input.low = seq;
2cd08467	349	XFRM_SKB_CB(skb)->seq.input.hi = seq_hi;
1bf06cd2	350
3bc07321	351	skb_dst_force(skb);
071d36bf	352	dev_hold(skb->dev);
3bc07321	353
d77e38e6 SK	354	if (crypto_done)
	355	nexthdr = x->type_offload->input_tail(x, skb);
	356	else
	357	nexthdr = x->type->input(x, skb);
0ebea8ef	358
1bf06cd2 HX	359	if (nexthdr == -EINPROGRESS)
1bf06cd2 HX	360	return 0;
1bf06cd2	361	resume:
071d36bf SAK	362	dev_put(skb->dev);
071d36bf SAK	363
0ebea8ef	364	spin_lock(&x->lock);
668dc8af	365	if (nexthdr <= 0) {
9dd3245a HX	366	if (nexthdr == -EBADMSG) {
	367	xfrm_audit_state_icvfail(x, skb,
	368	x->type->proto);
668dc8af	369	x->stats.integrity_failed++;
9dd3245a	370	}
59c9940e	371	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
716062fd	372	goto drop_unlock;
668dc8af	373	}
716062fd	374
716062fd HX	375	/* only the first xfrm gets the encap type */
	376	encap_type = 0;
	377
3b59df46	378	if (async && x->repl->recheck(x, skb, seq)) {
bcf66bf5 SK	379	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
	380	goto drop_unlock;
	381	}
	382
9fdc4883	383	x->repl->advance(x, seq);
716062fd HX	384
	385	x->curlft.bytes += skb->len;
	386	x->curlft.packets++;
	387
	388	spin_unlock(&x->lock);
	389
60d5fcfb HX	390	XFRM_MODE_SKB_CB(skb)->protocol = nexthdr;
60d5fcfb HX	391
df9dcb45 KM	392	inner_mode = x->inner_mode;
	393
	394	if (x->sel.family == AF_UNSPEC) {
	395	inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
cb866e32 SK	396	if (inner_mode == NULL) {
cb866e32 SK	397	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
df9dcb45	398	goto drop;
cb866e32	399	}
df9dcb45 KM	400	}
	401
	402	if (inner_mode->input(x, skb)) {
59c9940e	403	XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
716062fd	404	goto drop;
0aa64774	405	}
716062fd HX	406
	407	if (x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) {
	408	decaps = 1;
	409	break;
	410	}
	411
1bf06cd2 HX	412	/*
	413	* We need the inner address. However, we only get here for
	414	* transport mode so the outer address is identical.
	415	*/
	416	daddr = &x->id.daddr;
2fcb45b6	417	family = x->outer_mode->afinfo->family;
1bf06cd2	418
716062fd	419	err = xfrm_parse_spi(skb, nexthdr, &spi, &seq);
0aa64774	420	if (err < 0) {
59c9940e	421	XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
716062fd	422	goto drop;
0aa64774	423	}
716062fd HX	424	} while (!err);
716062fd HX	425
3328715e SK	426	err = xfrm_rcv_cb(skb, family, x->type->proto, 0);
	427	if (err)
	428	goto drop;
	429
716062fd HX	430	nf_reset(skb);
	431
	432	if (decaps) {
23e9fcfe AK	433	if (skb->sp)
23e9fcfe AK	434	skb->sp->olen = 0;
adf30907	435	skb_dst_drop(skb);
1995876a	436	gro_cells_receive(&gro_cells, skb);
716062fd HX	437	return 0;
716062fd HX	438	} else {
7785bba2 SK	439	xo = xfrm_offload(skb);
	440	if (xo)
	441	xfrm_gro = xo->flags & XFRM_GRO;
	442
cfcf99f9	443	err = x->inner_mode->afinfo->transport_finish(skb, xfrm_gro \|\| async);
7785bba2	444	if (xfrm_gro) {
23e9fcfe AK	445	if (skb->sp)
23e9fcfe AK	446	skb->sp->olen = 0;
7785bba2 SK	447	skb_dst_drop(skb);
	448	gro_cells_receive(&gro_cells, skb);
	449	return err;
	450	}
	451
	452	return err;
716062fd HX	453	}
	454
	455	drop_unlock:
	456	spin_unlock(&x->lock);
716062fd	457	drop:
3328715e	458	xfrm_rcv_cb(skb, family, x && x->type ? x->type->proto : nexthdr, -1);
716062fd HX	459	kfree_skb(skb);
	460	return 0;
	461	}
	462	EXPORT_SYMBOL(xfrm_input);
	463
1bf06cd2 HX	464	int xfrm_input_resume(struct sk_buff *skb, int nexthdr)
	465	{
	466	return xfrm_input(skb, nexthdr, 0, -1);
	467	}
	468	EXPORT_SYMBOL(xfrm_input_resume);
	469
1da177e4 LT	470	void __init xfrm_input_init(void)
1da177e4 LT	471	{
1995876a SK	472	int err;
	473
	474	init_dummy_netdev(&xfrm_napi_dev);
	475	err = gro_cells_init(&gro_cells, &xfrm_napi_dev);
	476	if (err)
	477	gro_cells.cells = NULL;
	478
1da177e4 LT	479	secpath_cachep = kmem_cache_create("secpath_cache",
1da177e4 LT	480	sizeof(struct sec_path),
e5d679f3	481	0, SLAB_HWCACHE_ALIGN\|SLAB_PANIC,
20c2df83	482	NULL);
1da177e4	483	}