[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_rcv_spi(struct sk_buff *skb, u32 spi)
{
	int err;
	u32 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->nh.raw[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, 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->nh.raw[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) { /* 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->nh.raw);

		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);
}
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
d2acc347	19	int xfrm6_rcv_spi(struct sk_buff *skb, u32 spi)
1da177e4	20	{
1da177e4 LT	21	int err;
1da177e4 LT	22	u32 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;
1da177e4 LT	31	nexthdr = skb->nh.raw[nhoff];
	32
	33	seq = 0;
	34	if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0)
	35	goto drop;
	36
	37	do {
	38	struct ipv6hdr *iph = skb->nh.ipv6h;
	39
	40	if (xfrm_nr == XFRM_MAX_DEPTH)
	41	goto drop;
	42
	43	x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, spi, nexthdr, AF_INET6);
	44	if (x == NULL)
	45	goto drop;
	46	spin_lock(&x->lock);
	47	if (unlikely(x->km.state != XFRM_STATE_VALID))
	48	goto drop_unlock;
	49
	50	if (x->props.replay_window && xfrm_replay_check(x, seq))
	51	goto drop_unlock;
	52
	53	if (xfrm_state_check_expire(x))
	54	goto drop_unlock;
	55
e695633e	56	nexthdr = x->type->input(x, skb);
1da177e4 LT	57	if (nexthdr <= 0)
	58	goto drop_unlock;
	59
	60	skb->nh.raw[nhoff] = nexthdr;
	61
	62	if (x->props.replay_window)
	63	xfrm_replay_advance(x, seq);
	64
	65	x->curlft.bytes += skb->len;
	66	x->curlft.packets++;
	67
	68	spin_unlock(&x->lock);
	69
dbe5b4aa	70	xfrm_vec[xfrm_nr++] = x;
1da177e4	71
b59f45d0 HX	72	if (x->mode->input(x, skb))
	73	goto drop;
	74
1da177e4	75	if (x->props.mode) { /* XXX */
1da177e4 LT	76	decaps = 1;
	77	break;
	78	}
	79
	80	if ((err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) < 0)
	81	goto drop;
	82	} while (!err);
	83
	84	/* Allocate new secpath or COW existing one. */
	85	if (!skb->sp \|\| atomic_read(&skb->sp->refcnt) != 1) {
	86	struct sec_path *sp;
	87	sp = secpath_dup(skb->sp);
	88	if (!sp)
	89	goto drop;
	90	if (skb->sp)
	91	secpath_put(skb->sp);
	92	skb->sp = sp;
	93	}
	94
	95	if (xfrm_nr + skb->sp->len > XFRM_MAX_DEPTH)
	96	goto drop;
	97
dbe5b4aa HX	98	memcpy(skb->sp->xvec + skb->sp->len, xfrm_vec,
dbe5b4aa HX	99	xfrm_nr * sizeof(xfrm_vec[0]));
1da177e4 LT	100	skb->sp->len += xfrm_nr;
	101	skb->ip_summed = CHECKSUM_NONE;
	102
b05e1066 PM	103	nf_reset(skb);
b05e1066 PM	104
1da177e4 LT	105	if (decaps) {
	106	if (!(skb->dev->flags&IFF_LOOPBACK)) {
	107	dst_release(skb->dst);
	108	skb->dst = NULL;
	109	}
	110	netif_rx(skb);
	111	return -1;
	112	} else {
b05e1066 PM	113	#ifdef CONFIG_NETFILTER
	114	skb->nh.ipv6h->payload_len = htons(skb->len);
	115	__skb_push(skb, skb->data - skb->nh.raw);
	116
	117	NF_HOOK(PF_INET6, NF_IP6_PRE_ROUTING, skb, skb->dev, NULL,
	118	ip6_rcv_finish);
	119	return -1;
	120	#else
1da177e4	121	return 1;
b05e1066	122	#endif
1da177e4 LT	123	}
	124
	125	drop_unlock:
	126	spin_unlock(&x->lock);
	127	xfrm_state_put(x);
	128	drop:
	129	while (--xfrm_nr >= 0)
dbe5b4aa	130	xfrm_state_put(xfrm_vec[xfrm_nr]);
1da177e4 LT	131	kfree_skb(skb);
	132	return -1;
	133	}
	134
	135	EXPORT_SYMBOL(xfrm6_rcv_spi);
	136
951dbc8a	137	int xfrm6_rcv(struct sk_buff **pskb)
1da177e4	138	{
d2acc347	139	return xfrm6_rcv_spi(*pskb, 0);
1da177e4	140	}