[mirror_ubuntu-zesty-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;

#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	{
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
b05e1066	37	#ifdef CONFIG_NETFILTER
716062fd HX	38	ipv6_hdr(skb)->payload_len = htons(skb->len);
716062fd HX	39	__skb_push(skb, skb->data - skb_network_header(skb));
b05e1066	40
6e23ae2a	41	NF_HOOK(PF_INET6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL,
716062fd HX	42	ip6_rcv_finish);
716062fd HX	43	return -1;
b05e1066	44	#else
1bf06cd2 HX	45	if (async)
	46	return ip6_rcv_finish(skb);
	47
716062fd	48	return 1;
b05e1066	49	#endif
1da177e4 LT	50	}
1da177e4 LT	51
e5bbef20	52	int xfrm6_rcv(struct sk_buff *skb)
1da177e4	53	{
33b5ecb8 HX	54	return xfrm6_rcv_spi(skb, skb_network_header(skb)[IP6CB(skb)->nhoff],
33b5ecb8 HX	55	0);
1da177e4	56	}
fbd9a5b4	57
7159039a YH	58	EXPORT_SYMBOL(xfrm6_rcv);
7159039a YH	59
fbd9a5b4 MN	60	int xfrm6_input_addr(struct sk_buff skb, xfrm_address_t daddr,
	61	xfrm_address_t *saddr, u8 proto)
	62	{
1ab1457c YH	63	struct xfrm_state *x = NULL;
1ab1457c YH	64	int wildcard = 0;
fbd9a5b4 MN	65	xfrm_address_t *xany;
fbd9a5b4 MN	66	struct xfrm_state *xfrm_vec_one = NULL;
1ab1457c	67	int nh = 0;
fbd9a5b4 MN	68	int i = 0;
fbd9a5b4 MN	69
c53b3590	70	xany = (xfrm_address_t *)&in6addr_any;
fbd9a5b4 MN	71
	72	for (i = 0; i < 3; i++) {
	73	xfrm_address_t dst, src;
	74	switch (i) {
	75	case 0:
	76	dst = daddr;
	77	src = saddr;
	78	break;
	79	case 1:
	80	/* lookup state with wild-card source address */
	81	wildcard = 1;
	82	dst = daddr;
	83	src = xany;
	84	break;
	85	case 2:
	86	default:
1ab1457c	87	/* lookup state with wild-card addresses */
fbd9a5b4 MN	88	wildcard = 1; /* XXX */
	89	dst = xany;
	90	src = xany;
	91	break;
1ab1457c	92	}
fbd9a5b4 MN	93
	94	x = xfrm_state_lookup_byaddr(dst, src, proto, AF_INET6);
	95	if (!x)
	96	continue;
	97
	98	spin_lock(&x->lock);
	99
	100	if (wildcard) {
	101	if ((x->props.flags & XFRM_STATE_WILDRECV) == 0) {
	102	spin_unlock(&x->lock);
	103	xfrm_state_put(x);
	104	x = NULL;
	105	continue;
	106	}
	107	}
	108
	109	if (unlikely(x->km.state != XFRM_STATE_VALID)) {
	110	spin_unlock(&x->lock);
	111	xfrm_state_put(x);
1ab1457c YH	112	x = NULL;
1ab1457c YH	113	continue;
fbd9a5b4 MN	114	}
	115	if (xfrm_state_check_expire(x)) {
	116	spin_unlock(&x->lock);
	117	xfrm_state_put(x);
	118	x = NULL;
	119	continue;
	120	}
	121
	122	nh = x->type->input(x, skb);
	123	if (nh <= 0) {
	124	spin_unlock(&x->lock);
	125	xfrm_state_put(x);
	126	x = NULL;
	127	continue;
	128	}
	129
	130	x->curlft.bytes += skb->len;
	131	x->curlft.packets++;
	132
	133	spin_unlock(&x->lock);
	134
	135	xfrm_vec_one = x;
	136	break;
	137	}
	138
	139	if (!xfrm_vec_one)
	140	goto drop;
	141
	142	/* Allocate new secpath or COW existing one. */
	143	if (!skb->sp \|\| atomic_read(&skb->sp->refcnt) != 1) {
	144	struct sec_path *sp;
	145	sp = secpath_dup(skb->sp);
	146	if (!sp)
	147	goto drop;
	148	if (skb->sp)
	149	secpath_put(skb->sp);
	150	skb->sp = sp;
	151	}
	152
	153	if (1 + skb->sp->len > XFRM_MAX_DEPTH)
	154	goto drop;
	155
	156	skb->sp->xvec[skb->sp->len] = xfrm_vec_one;
	157	skb->sp->len ++;
	158
	159	return 1;
	160	drop:
	161	if (xfrm_vec_one)
	162	xfrm_state_put(xfrm_vec_one);
	163	return -1;
	164	}
7159039a YH	165
7159039a YH	166	EXPORT_SYMBOL(xfrm6_input_addr);