[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;
	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
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	65	xfrm_address_t *xany;
1ab1457c	66	int nh = 0;
fbd9a5b4 MN	67	int i = 0;
fbd9a5b4 MN	68
9473e1f6 MN	69	/* Allocate new secpath or COW existing one. */
	70	if (!skb->sp \|\| atomic_read(&skb->sp->refcnt) != 1) {
	71	struct sec_path *sp;
	72
	73	sp = secpath_dup(skb->sp);
	74	if (!sp) {
0aa64774	75	XFRM_INC_STATS(LINUX_MIB_XFRMINERROR);
9473e1f6 MN	76	goto drop;
	77	}
	78	if (skb->sp)
	79	secpath_put(skb->sp);
	80	skb->sp = sp;
	81	}
	82
	83	if (1 + skb->sp->len == XFRM_MAX_DEPTH) {
0aa64774	84	XFRM_INC_STATS(LINUX_MIB_XFRMINBUFFERERROR);
9473e1f6 MN	85	goto drop;
	86	}
	87
c53b3590	88	xany = (xfrm_address_t *)&in6addr_any;
fbd9a5b4 MN	89
	90	for (i = 0; i < 3; i++) {
	91	xfrm_address_t dst, src;
	92	switch (i) {
	93	case 0:
	94	dst = daddr;
	95	src = saddr;
	96	break;
	97	case 1:
	98	/* lookup state with wild-card source address */
	99	wildcard = 1;
	100	dst = daddr;
	101	src = xany;
	102	break;
	103	case 2:
	104	default:
1ab1457c	105	/* lookup state with wild-card addresses */
fbd9a5b4 MN	106	wildcard = 1; /* XXX */
	107	dst = xany;
	108	src = xany;
	109	break;
1ab1457c	110	}
fbd9a5b4 MN	111
	112	x = xfrm_state_lookup_byaddr(dst, src, proto, AF_INET6);
	113	if (!x)
	114	continue;
	115
	116	spin_lock(&x->lock);
	117
	118	if (wildcard) {
	119	if ((x->props.flags & XFRM_STATE_WILDRECV) == 0) {
	120	spin_unlock(&x->lock);
	121	xfrm_state_put(x);
	122	x = NULL;
	123	continue;
	124	}
	125	}
	126
	127	if (unlikely(x->km.state != XFRM_STATE_VALID)) {
	128	spin_unlock(&x->lock);
	129	xfrm_state_put(x);
1ab1457c YH	130	x = NULL;
1ab1457c YH	131	continue;
fbd9a5b4 MN	132	}
	133	if (xfrm_state_check_expire(x)) {
	134	spin_unlock(&x->lock);
	135	xfrm_state_put(x);
	136	x = NULL;
	137	continue;
	138	}
	139
9473e1f6 MN	140	spin_unlock(&x->lock);
9473e1f6 MN	141
fbd9a5b4 MN	142	nh = x->type->input(x, skb);
fbd9a5b4 MN	143	if (nh <= 0) {
fbd9a5b4 MN	144	xfrm_state_put(x);
	145	x = NULL;
	146	continue;
	147	}
	148
9473e1f6	149	/* Found a state */
fbd9a5b4 MN	150	break;
	151	}
	152
9473e1f6	153	if (!x) {
0aa64774	154	XFRM_INC_STATS(LINUX_MIB_XFRMINNOSTATES);
afeb14b4	155	xfrm_audit_state_notfound_simple(skb, AF_INET6);
fbd9a5b4	156	goto drop;
fbd9a5b4 MN	157	}
fbd9a5b4 MN	158
9473e1f6 MN	159	skb->sp->xvec[skb->sp->len++] = x;
	160
	161	spin_lock(&x->lock);
fbd9a5b4	162
9473e1f6 MN	163	x->curlft.bytes += skb->len;
	164	x->curlft.packets++;
	165
	166	spin_unlock(&x->lock);
fbd9a5b4 MN	167
fbd9a5b4 MN	168	return 1;
9473e1f6	169
fbd9a5b4	170	drop:
fbd9a5b4 MN	171	return -1;
fbd9a5b4 MN	172	}
7159039a YH	173
7159039a YH	174	EXPORT_SYMBOL(xfrm6_input_addr);