[mirror_ubuntu-artful-kernel.git] / net / ipv6 / xfrm6_input.c

/*
 * xfrm6_input.c: based on net/ipv4/xfrm4_input.c
 *
 * Authors:
 *	Mitsuru KANDA @USAGI
 * 	Kazunori MIYAZAWA @USAGI
 * 	Kunihiro Ishiguro <kunihiro@ipinfusion.com>
 *	YOSHIFUJI Hideaki @USAGI
 *		IPv6 support
 */

#include <linux/module.h>
#include <linux/string.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv6.h>
#include <net/ipv6.h>
#include <net/xfrm.h>

int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb)
{
	return xfrm6_extract_header(skb);
}

int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
{
	XFRM_SPI_SKB_CB(skb)->family = AF_INET6;
	XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);
	return xfrm_input(skb, nexthdr, spi, 0);
}
EXPORT_SYMBOL(xfrm6_rcv_spi);

int xfrm6_transport_finish(struct sk_buff *skb, int async)
{
	skb_network_header(skb)[IP6CB(skb)->nhoff] =
		XFRM_MODE_SKB_CB(skb)->protocol;

#ifndef CONFIG_NETFILTER
	if (!async)
		return 1;
#endif

	ipv6_hdr(skb)->payload_len = htons(skb->len);
	__skb_push(skb, skb->data - skb_network_header(skb));

	NF_HOOK(PF_INET6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL,
		ip6_rcv_finish);
	return -1;
}

int xfrm6_rcv(struct sk_buff *skb)
{
	return xfrm6_rcv_spi(skb, skb_network_header(skb)[IP6CB(skb)->nhoff],
			     0);
}

EXPORT_SYMBOL(xfrm6_rcv);

int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
		     xfrm_address_t *saddr, u8 proto)
{
	struct xfrm_state *x = NULL;
	int i = 0;

	/* 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(LINUX_MIB_XFRMINERROR);
			goto drop;
		}
		if (skb->sp)
			secpath_put(skb->sp);
		skb->sp = sp;
	}

	if (1 + skb->sp->len == XFRM_MAX_DEPTH) {
		XFRM_INC_STATS(LINUX_MIB_XFRMINBUFFERERROR);
		goto drop;
	}

	for (i = 0; i < 3; i++) {
		xfrm_address_t *dst, *src;

		switch (i) {
		case 0:
			dst = daddr;
			src = saddr;
			break;
		case 1:
			/* lookup state with wild-card source address */
			dst = daddr;
			src = (xfrm_address_t *)&in6addr_any;
			break;
		default:
			/* lookup state with wild-card addresses */
			dst = (xfrm_address_t *)&in6addr_any;
			src = (xfrm_address_t *)&in6addr_any;
			break;
		}

		x = xfrm_state_lookup_byaddr(&init_net, dst, src, proto, AF_INET6);
		if (!x)
			continue;

		spin_lock(&x->lock);

		if ((!i || (x->props.flags & XFRM_STATE_WILDRECV)) &&
		    likely(x->km.state == XFRM_STATE_VALID) &&
		    !xfrm_state_check_expire(x)) {
			spin_unlock(&x->lock);
			if (x->type->input(x, skb) > 0) {
				/* found a valid state */
				break;
			}
		} else
			spin_unlock(&x->lock);

		xfrm_state_put(x);
		x = NULL;
	}

	if (!x) {
		XFRM_INC_STATS(LINUX_MIB_XFRMINNOSTATES);
		xfrm_audit_state_notfound_simple(skb, AF_INET6);
		goto drop;
	}

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

	spin_lock(&x->lock);

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

	spin_unlock(&x->lock);

	return 1;

drop:
	return -1;
}

EXPORT_SYMBOL(xfrm6_input_addr);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* xfrm6_input.c: based on net/ipv4/xfrm4_input.c
	3	*
	4	* Authors:
	5	* Mitsuru KANDA @USAGI
	6	* Kazunori MIYAZAWA @USAGI
	7	* Kunihiro Ishiguro <kunihiro@ipinfusion.com>
	8	* YOSHIFUJI Hideaki @USAGI
	9	* IPv6 support
	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/string.h>
b05e1066 PM	14	#include <linux/netfilter.h>
b05e1066 PM	15	#include <linux/netfilter_ipv6.h>
1da177e4 LT	16	#include <net/ipv6.h>
	17	#include <net/xfrm.h>
	18
227620e2 HX	19	int xfrm6_extract_input(struct xfrm_state x, struct sk_buff skb)
	20	{
	21	return xfrm6_extract_header(skb);
	22	}
	23
33b5ecb8	24	int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1da177e4	25	{
2fcb45b6	26	XFRM_SPI_SKB_CB(skb)->family = AF_INET6;
716062fd HX	27	XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);
	28	return xfrm_input(skb, nexthdr, spi, 0);
	29	}
	30	EXPORT_SYMBOL(xfrm6_rcv_spi);
b05e1066	31
716062fd HX	32	int xfrm6_transport_finish(struct sk_buff *skb, int async)
716062fd HX	33	{
60d5fcfb HX	34	skb_network_header(skb)[IP6CB(skb)->nhoff] =
	35	XFRM_MODE_SKB_CB(skb)->protocol;
	36
0883ae0e HX	37	#ifndef CONFIG_NETFILTER
	38	if (!async)
	39	return 1;
	40	#endif
	41
716062fd HX	42	ipv6_hdr(skb)->payload_len = htons(skb->len);
716062fd HX	43	__skb_push(skb, skb->data - skb_network_header(skb));
b05e1066	44
6e23ae2a	45	NF_HOOK(PF_INET6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL,
716062fd HX	46	ip6_rcv_finish);
716062fd HX	47	return -1;
1da177e4 LT	48	}
1da177e4 LT	49
e5bbef20	50	int xfrm6_rcv(struct sk_buff *skb)
1da177e4	51	{
33b5ecb8 HX	52	return xfrm6_rcv_spi(skb, skb_network_header(skb)[IP6CB(skb)->nhoff],
33b5ecb8 HX	53	0);
1da177e4	54	}
fbd9a5b4	55
7159039a YH	56	EXPORT_SYMBOL(xfrm6_rcv);
7159039a YH	57
fbd9a5b4 MN	58	int xfrm6_input_addr(struct sk_buff skb, xfrm_address_t daddr,
	59	xfrm_address_t *saddr, u8 proto)
	60	{
1ab1457c	61	struct xfrm_state *x = NULL;
fbd9a5b4 MN	62	int i = 0;
fbd9a5b4 MN	63
9473e1f6 MN	64	/* Allocate new secpath or COW existing one. */
	65	if (!skb->sp \|\| atomic_read(&skb->sp->refcnt) != 1) {
	66	struct sec_path *sp;
	67
	68	sp = secpath_dup(skb->sp);
	69	if (!sp) {
0aa64774	70	XFRM_INC_STATS(LINUX_MIB_XFRMINERROR);
9473e1f6 MN	71	goto drop;
	72	}
	73	if (skb->sp)
	74	secpath_put(skb->sp);
	75	skb->sp = sp;
	76	}
	77
	78	if (1 + skb->sp->len == XFRM_MAX_DEPTH) {
0aa64774	79	XFRM_INC_STATS(LINUX_MIB_XFRMINBUFFERERROR);
9473e1f6 MN	80	goto drop;
	81	}
	82
fbd9a5b4 MN	83	for (i = 0; i < 3; i++) {
fbd9a5b4 MN	84	xfrm_address_t dst, src;
a002c6fd	85
fbd9a5b4 MN	86	switch (i) {
	87	case 0:
	88	dst = daddr;
	89	src = saddr;
	90	break;
	91	case 1:
	92	/* lookup state with wild-card source address */
fbd9a5b4	93	dst = daddr;
a002c6fd	94	src = (xfrm_address_t *)&in6addr_any;
fbd9a5b4	95	break;
fbd9a5b4	96	default:
1ab1457c	97	/* lookup state with wild-card addresses */
a002c6fd YH	98	dst = (xfrm_address_t *)&in6addr_any;
a002c6fd YH	99	src = (xfrm_address_t *)&in6addr_any;
fbd9a5b4	100	break;
1ab1457c	101	}
fbd9a5b4	102
221df1ed	103	x = xfrm_state_lookup_byaddr(&init_net, dst, src, proto, AF_INET6);
fbd9a5b4 MN	104	if (!x)
	105	continue;
	106
	107	spin_lock(&x->lock);
	108
a002c6fd YH	109	if ((!i \|\| (x->props.flags & XFRM_STATE_WILDRECV)) &&
	110	likely(x->km.state == XFRM_STATE_VALID) &&
	111	!xfrm_state_check_expire(x)) {
fbd9a5b4	112	spin_unlock(&x->lock);
a002c6fd YH	113	if (x->type->input(x, skb) > 0) {
	114	/* found a valid state */
	115	break;
	116	}
	117	} else
fbd9a5b4	118	spin_unlock(&x->lock);
fbd9a5b4	119
a002c6fd YH	120	xfrm_state_put(x);
a002c6fd YH	121	x = NULL;
fbd9a5b4 MN	122	}
fbd9a5b4 MN	123
9473e1f6	124	if (!x) {
0aa64774	125	XFRM_INC_STATS(LINUX_MIB_XFRMINNOSTATES);
afeb14b4	126	xfrm_audit_state_notfound_simple(skb, AF_INET6);
fbd9a5b4	127	goto drop;
fbd9a5b4 MN	128	}
fbd9a5b4 MN	129
9473e1f6 MN	130	skb->sp->xvec[skb->sp->len++] = x;
	131
	132	spin_lock(&x->lock);
fbd9a5b4	133
9473e1f6 MN	134	x->curlft.bytes += skb->len;
	135	x->curlft.packets++;
	136
	137	spin_unlock(&x->lock);
fbd9a5b4 MN	138
fbd9a5b4 MN	139	return 1;
9473e1f6	140
fbd9a5b4	141	drop:
fbd9a5b4 MN	142	return -1;
fbd9a5b4 MN	143	}
7159039a YH	144
7159039a YH	145	EXPORT_SYMBOL(xfrm6_input_addr);