[deliverable/linux.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)->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;

#ifdef CONFIG_NETFILTER
	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;
#else
	if (async)
		return ip6_rcv_finish(skb);

	return 1;
#endif
}

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 wildcard = 0;
	xfrm_address_t *xany;
	struct xfrm_state *xfrm_vec_one = NULL;
	int nh = 0;
	int i = 0;

	xany = (xfrm_address_t *)&in6addr_any;

	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 */
			wildcard = 1;
			dst = daddr;
			src = xany;
			break;
		case 2:
		default:
			/* lookup state with wild-card addresses */
			wildcard = 1; /* XXX */
			dst = xany;
			src = xany;
			break;
		}

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

		spin_lock(&x->lock);

		if (wildcard) {
			if ((x->props.flags & XFRM_STATE_WILDRECV) == 0) {
				spin_unlock(&x->lock);
				xfrm_state_put(x);
				x = NULL;
				continue;
			}
		}

		if (unlikely(x->km.state != XFRM_STATE_VALID)) {
			spin_unlock(&x->lock);
			xfrm_state_put(x);
			x = NULL;
			continue;
		}
		if (xfrm_state_check_expire(x)) {
			spin_unlock(&x->lock);
			xfrm_state_put(x);
			x = NULL;
			continue;
		}

		nh = x->type->input(x, skb);
		if (nh <= 0) {
			spin_unlock(&x->lock);
			xfrm_state_put(x);
			x = NULL;
			continue;
		}

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

		spin_unlock(&x->lock);

		xfrm_vec_one = x;
		break;
	}

	if (!xfrm_vec_one)
		goto drop;

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

	if (1 + skb->sp->len > XFRM_MAX_DEPTH)
		goto drop;

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

	return 1;
drop:
	if (xfrm_vec_one)
		xfrm_state_put(xfrm_vec_one);
	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	{
716062fd HX	26	XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);
	27	return xfrm_input(skb, nexthdr, spi, 0);
	28	}
	29	EXPORT_SYMBOL(xfrm6_rcv_spi);
b05e1066	30
716062fd HX	31	int xfrm6_transport_finish(struct sk_buff *skb, int async)
716062fd HX	32	{
60d5fcfb HX	33	skb_network_header(skb)[IP6CB(skb)->nhoff] =
	34	XFRM_MODE_SKB_CB(skb)->protocol;
	35
b05e1066	36	#ifdef CONFIG_NETFILTER
716062fd HX	37	ipv6_hdr(skb)->payload_len = htons(skb->len);
716062fd HX	38	__skb_push(skb, skb->data - skb_network_header(skb));
b05e1066	39
6e23ae2a	40	NF_HOOK(PF_INET6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL,
716062fd HX	41	ip6_rcv_finish);
716062fd HX	42	return -1;
b05e1066	43	#else
1bf06cd2 HX	44	if (async)
	45	return ip6_rcv_finish(skb);
	46
716062fd	47	return 1;
b05e1066	48	#endif
1da177e4 LT	49	}
1da177e4 LT	50
e5bbef20	51	int xfrm6_rcv(struct sk_buff *skb)
1da177e4	52	{
33b5ecb8 HX	53	return xfrm6_rcv_spi(skb, skb_network_header(skb)[IP6CB(skb)->nhoff],
33b5ecb8 HX	54	0);
1da177e4	55	}
fbd9a5b4	56
7159039a YH	57	EXPORT_SYMBOL(xfrm6_rcv);
7159039a YH	58
fbd9a5b4 MN	59	int xfrm6_input_addr(struct sk_buff skb, xfrm_address_t daddr,
	60	xfrm_address_t *saddr, u8 proto)
	61	{
1ab1457c YH	62	struct xfrm_state *x = NULL;
1ab1457c YH	63	int wildcard = 0;
fbd9a5b4 MN	64	xfrm_address_t *xany;
fbd9a5b4 MN	65	struct xfrm_state *xfrm_vec_one = NULL;
1ab1457c	66	int nh = 0;
fbd9a5b4 MN	67	int i = 0;
fbd9a5b4 MN	68
c53b3590	69	xany = (xfrm_address_t *)&in6addr_any;
fbd9a5b4 MN	70
	71	for (i = 0; i < 3; i++) {
	72	xfrm_address_t dst, src;
	73	switch (i) {
	74	case 0:
	75	dst = daddr;
	76	src = saddr;
	77	break;
	78	case 1:
	79	/* lookup state with wild-card source address */
	80	wildcard = 1;
	81	dst = daddr;
	82	src = xany;
	83	break;
	84	case 2:
	85	default:
1ab1457c	86	/* lookup state with wild-card addresses */
fbd9a5b4 MN	87	wildcard = 1; /* XXX */
	88	dst = xany;
	89	src = xany;
	90	break;
1ab1457c	91	}
fbd9a5b4 MN	92
	93	x = xfrm_state_lookup_byaddr(dst, src, proto, AF_INET6);
	94	if (!x)
	95	continue;
	96
	97	spin_lock(&x->lock);
	98
	99	if (wildcard) {
	100	if ((x->props.flags & XFRM_STATE_WILDRECV) == 0) {
	101	spin_unlock(&x->lock);
	102	xfrm_state_put(x);
	103	x = NULL;
	104	continue;
	105	}
	106	}
	107
	108	if (unlikely(x->km.state != XFRM_STATE_VALID)) {
	109	spin_unlock(&x->lock);
	110	xfrm_state_put(x);
1ab1457c YH	111	x = NULL;
1ab1457c YH	112	continue;
fbd9a5b4 MN	113	}
	114	if (xfrm_state_check_expire(x)) {
	115	spin_unlock(&x->lock);
	116	xfrm_state_put(x);
	117	x = NULL;
	118	continue;
	119	}
	120
	121	nh = x->type->input(x, skb);
	122	if (nh <= 0) {
	123	spin_unlock(&x->lock);
	124	xfrm_state_put(x);
	125	x = NULL;
	126	continue;
	127	}
	128
	129	x->curlft.bytes += skb->len;
	130	x->curlft.packets++;
	131
	132	spin_unlock(&x->lock);
	133
	134	xfrm_vec_one = x;
	135	break;
	136	}
	137
	138	if (!xfrm_vec_one)
	139	goto drop;
	140
	141	/* Allocate new secpath or COW existing one. */
	142	if (!skb->sp \|\| atomic_read(&skb->sp->refcnt) != 1) {
	143	struct sec_path *sp;
	144	sp = secpath_dup(skb->sp);
	145	if (!sp)
	146	goto drop;
	147	if (skb->sp)
	148	secpath_put(skb->sp);
	149	skb->sp = sp;
	150	}
	151
	152	if (1 + skb->sp->len > XFRM_MAX_DEPTH)
	153	goto drop;
	154
	155	skb->sp->xvec[skb->sp->len] = xfrm_vec_one;
	156	skb->sp->len ++;
	157
	158	return 1;
	159	drop:
	160	if (xfrm_vec_one)
	161	xfrm_state_put(xfrm_vec_one);
	162	return -1;
	163	}
7159039a YH	164
7159039a YH	165	EXPORT_SYMBOL(xfrm6_input_addr);