[net-next-2.6.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 wildcard = 0;
	xfrm_address_t *xany;
	int nh = 0;
	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;
	}

	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;
		}

		spin_unlock(&x->lock);

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

		/* Found a state */
		break;
	}

	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 YH	61	struct xfrm_state *x = NULL;
1ab1457c YH	62	int wildcard = 0;
fbd9a5b4	63	xfrm_address_t *xany;
1ab1457c	64	int nh = 0;
fbd9a5b4 MN	65	int i = 0;
fbd9a5b4 MN	66
9473e1f6 MN	67	/* Allocate new secpath or COW existing one. */
	68	if (!skb->sp \|\| atomic_read(&skb->sp->refcnt) != 1) {
	69	struct sec_path *sp;
	70
	71	sp = secpath_dup(skb->sp);
	72	if (!sp) {
0aa64774	73	XFRM_INC_STATS(LINUX_MIB_XFRMINERROR);
9473e1f6 MN	74	goto drop;
	75	}
	76	if (skb->sp)
	77	secpath_put(skb->sp);
	78	skb->sp = sp;
	79	}
	80
	81	if (1 + skb->sp->len == XFRM_MAX_DEPTH) {
0aa64774	82	XFRM_INC_STATS(LINUX_MIB_XFRMINBUFFERERROR);
9473e1f6 MN	83	goto drop;
	84	}
	85
c53b3590	86	xany = (xfrm_address_t *)&in6addr_any;
fbd9a5b4 MN	87
	88	for (i = 0; i < 3; i++) {
	89	xfrm_address_t dst, src;
	90	switch (i) {
	91	case 0:
	92	dst = daddr;
	93	src = saddr;
	94	break;
	95	case 1:
	96	/* lookup state with wild-card source address */
	97	wildcard = 1;
	98	dst = daddr;
	99	src = xany;
	100	break;
	101	case 2:
	102	default:
1ab1457c	103	/* lookup state with wild-card addresses */
fbd9a5b4 MN	104	wildcard = 1; /* XXX */
	105	dst = xany;
	106	src = xany;
	107	break;
1ab1457c	108	}
fbd9a5b4 MN	109
	110	x = xfrm_state_lookup_byaddr(dst, src, proto, AF_INET6);
	111	if (!x)
	112	continue;
	113
	114	spin_lock(&x->lock);
	115
	116	if (wildcard) {
	117	if ((x->props.flags & XFRM_STATE_WILDRECV) == 0) {
	118	spin_unlock(&x->lock);
	119	xfrm_state_put(x);
	120	x = NULL;
	121	continue;
	122	}
	123	}
	124
	125	if (unlikely(x->km.state != XFRM_STATE_VALID)) {
	126	spin_unlock(&x->lock);
	127	xfrm_state_put(x);
1ab1457c YH	128	x = NULL;
1ab1457c YH	129	continue;
fbd9a5b4 MN	130	}
	131	if (xfrm_state_check_expire(x)) {
	132	spin_unlock(&x->lock);
	133	xfrm_state_put(x);
	134	x = NULL;
	135	continue;
	136	}
	137
9473e1f6 MN	138	spin_unlock(&x->lock);
9473e1f6 MN	139
fbd9a5b4 MN	140	nh = x->type->input(x, skb);
fbd9a5b4 MN	141	if (nh <= 0) {
fbd9a5b4 MN	142	xfrm_state_put(x);
	143	x = NULL;
	144	continue;
	145	}
	146
9473e1f6	147	/* Found a state */
fbd9a5b4 MN	148	break;
	149	}
	150
9473e1f6	151	if (!x) {
0aa64774	152	XFRM_INC_STATS(LINUX_MIB_XFRMINNOSTATES);
afeb14b4	153	xfrm_audit_state_notfound_simple(skb, AF_INET6);
fbd9a5b4	154	goto drop;
fbd9a5b4 MN	155	}
fbd9a5b4 MN	156
9473e1f6 MN	157	skb->sp->xvec[skb->sp->len++] = x;
	158
	159	spin_lock(&x->lock);
fbd9a5b4	160
9473e1f6 MN	161	x->curlft.bytes += skb->len;
	162	x->curlft.packets++;
	163
	164	spin_unlock(&x->lock);
fbd9a5b4 MN	165
fbd9a5b4 MN	166	return 1;
9473e1f6	167
fbd9a5b4	168	drop:
fbd9a5b4 MN	169	return -1;
fbd9a5b4 MN	170	}
7159039a YH	171
7159039a YH	172	EXPORT_SYMBOL(xfrm6_input_addr);