[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_rcv_spi(struct sk_buff *skb, __be32 spi)
{
	int err;
	__be32 seq;
	struct xfrm_state *xfrm_vec[XFRM_MAX_DEPTH];
	struct xfrm_state *x;
	int xfrm_nr = 0;
	int decaps = 0;
	int nexthdr;
	unsigned int nhoff;

	nhoff = IP6CB(skb)->nhoff;
	nexthdr = skb_network_header(skb)[nhoff];

	seq = 0;
	if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0)
		goto drop;

	do {
		struct ipv6hdr *iph = skb->nh.ipv6h;

		if (xfrm_nr == XFRM_MAX_DEPTH)
			goto drop;

		x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, spi,
				nexthdr != IPPROTO_IPIP ? nexthdr : IPPROTO_IPV6, AF_INET6);
		if (x == NULL)
			goto drop;
		spin_lock(&x->lock);
		if (unlikely(x->km.state != XFRM_STATE_VALID))
			goto drop_unlock;

		if (x->props.replay_window && xfrm_replay_check(x, seq))
			goto drop_unlock;

		if (xfrm_state_check_expire(x))
			goto drop_unlock;

		nexthdr = x->type->input(x, skb);
		if (nexthdr <= 0)
			goto drop_unlock;

		skb_network_header(skb)[nhoff] = nexthdr;

		if (x->props.replay_window)
			xfrm_replay_advance(x, seq);

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

		spin_unlock(&x->lock);

		xfrm_vec[xfrm_nr++] = x;

		if (x->mode->input(x, skb))
			goto drop;

		if (x->props.mode == XFRM_MODE_TUNNEL) { /* XXX */
			decaps = 1;
			break;
		}

		if ((err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) < 0)
			goto drop;
	} while (!err);

	/* 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 (xfrm_nr + skb->sp->len > XFRM_MAX_DEPTH)
		goto drop;

	memcpy(skb->sp->xvec + skb->sp->len, xfrm_vec,
	       xfrm_nr * sizeof(xfrm_vec[0]));
	skb->sp->len += xfrm_nr;
	skb->ip_summed = CHECKSUM_NONE;

	nf_reset(skb);

	if (decaps) {
		if (!(skb->dev->flags&IFF_LOOPBACK)) {
			dst_release(skb->dst);
			skb->dst = NULL;
		}
		netif_rx(skb);
		return -1;
	} else {
#ifdef CONFIG_NETFILTER
		skb->nh.ipv6h->payload_len = htons(skb->len);
		__skb_push(skb, skb->data - skb_network_header(skb));

		NF_HOOK(PF_INET6, NF_IP6_PRE_ROUTING, skb, skb->dev, NULL,
			ip6_rcv_finish);
		return -1;
#else
		return 1;
#endif
	}

drop_unlock:
	spin_unlock(&x->lock);
	xfrm_state_put(x);
drop:
	while (--xfrm_nr >= 0)
		xfrm_state_put(xfrm_vec[xfrm_nr]);
	kfree_skb(skb);
	return -1;
}

EXPORT_SYMBOL(xfrm6_rcv_spi);

int xfrm6_rcv(struct sk_buff **pskb)
{
	return xfrm6_rcv_spi(*pskb, 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;
	struct in6_addr any;
	xfrm_address_t *xany;
	struct xfrm_state *xfrm_vec_one = NULL;
	int nh = 0;
	int i = 0;

	ipv6_addr_set(&any, 0, 0, 0, 0);
	xany = (xfrm_address_t *)&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
a252cc23	19	int xfrm6_rcv_spi(struct sk_buff *skb, __be32 spi)
1da177e4	20	{
1da177e4	21	int err;
6067b2ba	22	__be32 seq;
dbe5b4aa	23	struct xfrm_state *xfrm_vec[XFRM_MAX_DEPTH];
1da177e4 LT	24	struct xfrm_state *x;
	25	int xfrm_nr = 0;
	26	int decaps = 0;
	27	int nexthdr;
	28	unsigned int nhoff;
	29
951dbc8a	30	nhoff = IP6CB(skb)->nhoff;
d56f90a7	31	nexthdr = skb_network_header(skb)[nhoff];
1da177e4 LT	32
	33	seq = 0;
	34	if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0)
	35	goto drop;
1ab1457c	36
1da177e4 LT	37	do {
	38	struct ipv6hdr *iph = skb->nh.ipv6h;
	39
	40	if (xfrm_nr == XFRM_MAX_DEPTH)
	41	goto drop;
	42
73d605d1 KM	43	x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, spi,
73d605d1 KM	44	nexthdr != IPPROTO_IPIP ? nexthdr : IPPROTO_IPV6, AF_INET6);
1da177e4 LT	45	if (x == NULL)
	46	goto drop;
	47	spin_lock(&x->lock);
	48	if (unlikely(x->km.state != XFRM_STATE_VALID))
	49	goto drop_unlock;
	50
	51	if (x->props.replay_window && xfrm_replay_check(x, seq))
	52	goto drop_unlock;
	53
	54	if (xfrm_state_check_expire(x))
	55	goto drop_unlock;
	56
e695633e	57	nexthdr = x->type->input(x, skb);
1da177e4 LT	58	if (nexthdr <= 0)
	59	goto drop_unlock;
	60
d56f90a7	61	skb_network_header(skb)[nhoff] = nexthdr;
1da177e4 LT	62
	63	if (x->props.replay_window)
	64	xfrm_replay_advance(x, seq);
	65
	66	x->curlft.bytes += skb->len;
	67	x->curlft.packets++;
	68
	69	spin_unlock(&x->lock);
	70
dbe5b4aa	71	xfrm_vec[xfrm_nr++] = x;
1da177e4	72
b59f45d0 HX	73	if (x->mode->input(x, skb))
	74	goto drop;
	75
7e49e6de	76	if (x->props.mode == XFRM_MODE_TUNNEL) { /* XXX */
1da177e4 LT	77	decaps = 1;
	78	break;
	79	}
	80
	81	if ((err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) < 0)
	82	goto drop;
	83	} while (!err);
	84
	85	/* Allocate new secpath or COW existing one. */
	86	if (!skb->sp \|\| atomic_read(&skb->sp->refcnt) != 1) {
	87	struct sec_path *sp;
	88	sp = secpath_dup(skb->sp);
	89	if (!sp)
	90	goto drop;
	91	if (skb->sp)
	92	secpath_put(skb->sp);
	93	skb->sp = sp;
	94	}
	95
	96	if (xfrm_nr + skb->sp->len > XFRM_MAX_DEPTH)
	97	goto drop;
	98
dbe5b4aa HX	99	memcpy(skb->sp->xvec + skb->sp->len, xfrm_vec,
dbe5b4aa HX	100	xfrm_nr * sizeof(xfrm_vec[0]));
1da177e4 LT	101	skb->sp->len += xfrm_nr;
	102	skb->ip_summed = CHECKSUM_NONE;
	103
b05e1066 PM	104	nf_reset(skb);
b05e1066 PM	105
1da177e4 LT	106	if (decaps) {
	107	if (!(skb->dev->flags&IFF_LOOPBACK)) {
	108	dst_release(skb->dst);
	109	skb->dst = NULL;
	110	}
	111	netif_rx(skb);
	112	return -1;
	113	} else {
b05e1066 PM	114	#ifdef CONFIG_NETFILTER
b05e1066 PM	115	skb->nh.ipv6h->payload_len = htons(skb->len);
d56f90a7	116	__skb_push(skb, skb->data - skb_network_header(skb));
b05e1066 PM	117
b05e1066 PM	118	NF_HOOK(PF_INET6, NF_IP6_PRE_ROUTING, skb, skb->dev, NULL,
1ab1457c	119	ip6_rcv_finish);
b05e1066 PM	120	return -1;
b05e1066 PM	121	#else
1da177e4	122	return 1;
b05e1066	123	#endif
1da177e4 LT	124	}
	125
	126	drop_unlock:
	127	spin_unlock(&x->lock);
	128	xfrm_state_put(x);
	129	drop:
	130	while (--xfrm_nr >= 0)
dbe5b4aa	131	xfrm_state_put(xfrm_vec[xfrm_nr]);
1da177e4 LT	132	kfree_skb(skb);
	133	return -1;
	134	}
	135
	136	EXPORT_SYMBOL(xfrm6_rcv_spi);
	137
951dbc8a	138	int xfrm6_rcv(struct sk_buff **pskb)
1da177e4	139	{
d2acc347	140	return xfrm6_rcv_spi(*pskb, 0);
1da177e4	141	}
fbd9a5b4	142
7159039a YH	143	EXPORT_SYMBOL(xfrm6_rcv);
7159039a YH	144
fbd9a5b4 MN	145	int xfrm6_input_addr(struct sk_buff skb, xfrm_address_t daddr,
	146	xfrm_address_t *saddr, u8 proto)
	147	{
1ab1457c YH	148	struct xfrm_state *x = NULL;
1ab1457c YH	149	int wildcard = 0;
fbd9a5b4 MN	150	struct in6_addr any;
	151	xfrm_address_t *xany;
	152	struct xfrm_state *xfrm_vec_one = NULL;
1ab1457c	153	int nh = 0;
fbd9a5b4 MN	154	int i = 0;
	155
	156	ipv6_addr_set(&any, 0, 0, 0, 0);
	157	xany = (xfrm_address_t *)&any;
	158
	159	for (i = 0; i < 3; i++) {
	160	xfrm_address_t dst, src;
	161	switch (i) {
	162	case 0:
	163	dst = daddr;
	164	src = saddr;
	165	break;
	166	case 1:
	167	/* lookup state with wild-card source address */
	168	wildcard = 1;
	169	dst = daddr;
	170	src = xany;
	171	break;
	172	case 2:
	173	default:
1ab1457c	174	/* lookup state with wild-card addresses */
fbd9a5b4 MN	175	wildcard = 1; /* XXX */
	176	dst = xany;
	177	src = xany;
	178	break;
1ab1457c	179	}
fbd9a5b4 MN	180
	181	x = xfrm_state_lookup_byaddr(dst, src, proto, AF_INET6);
	182	if (!x)
	183	continue;
	184
	185	spin_lock(&x->lock);
	186
	187	if (wildcard) {
	188	if ((x->props.flags & XFRM_STATE_WILDRECV) == 0) {
	189	spin_unlock(&x->lock);
	190	xfrm_state_put(x);
	191	x = NULL;
	192	continue;
	193	}
	194	}
	195
	196	if (unlikely(x->km.state != XFRM_STATE_VALID)) {
	197	spin_unlock(&x->lock);
	198	xfrm_state_put(x);
1ab1457c YH	199	x = NULL;
1ab1457c YH	200	continue;
fbd9a5b4 MN	201	}
	202	if (xfrm_state_check_expire(x)) {
	203	spin_unlock(&x->lock);
	204	xfrm_state_put(x);
	205	x = NULL;
	206	continue;
	207	}
	208
	209	nh = x->type->input(x, skb);
	210	if (nh <= 0) {
	211	spin_unlock(&x->lock);
	212	xfrm_state_put(x);
	213	x = NULL;
	214	continue;
	215	}
	216
	217	x->curlft.bytes += skb->len;
	218	x->curlft.packets++;
	219
	220	spin_unlock(&x->lock);
	221
	222	xfrm_vec_one = x;
	223	break;
	224	}
	225
	226	if (!xfrm_vec_one)
	227	goto drop;
	228
	229	/* Allocate new secpath or COW existing one. */
	230	if (!skb->sp \|\| atomic_read(&skb->sp->refcnt) != 1) {
	231	struct sec_path *sp;
	232	sp = secpath_dup(skb->sp);
	233	if (!sp)
	234	goto drop;
	235	if (skb->sp)
	236	secpath_put(skb->sp);
	237	skb->sp = sp;
	238	}
	239
	240	if (1 + skb->sp->len > XFRM_MAX_DEPTH)
	241	goto drop;
	242
	243	skb->sp->xvec[skb->sp->len] = xfrm_vec_one;
	244	skb->sp->len ++;
	245
	246	return 1;
	247	drop:
	248	if (xfrm_vec_one)
	249	xfrm_state_put(xfrm_vec_one);
	250	return -1;
	251	}
7159039a YH	252
7159039a YH	253	EXPORT_SYMBOL(xfrm6_input_addr);