[net-next-2.6.git] / net / ipv4 / xfrm4_state.c

/*
 * xfrm4_state.c
 *
 * Changes:
 * 	YOSHIFUJI Hideaki @USAGI
 * 		Split up af-specific portion
 *
 */

#include <net/ip.h>
#include <net/xfrm.h>
#include <linux/pfkeyv2.h>
#include <linux/ipsec.h>

static struct xfrm_state_afinfo xfrm4_state_afinfo;

static int xfrm4_init_flags(struct xfrm_state *x)
{
	if (ipv4_config.no_pmtu_disc)
		x->props.flags |= XFRM_STATE_NOPMTUDISC;
	return 0;
}

static void
__xfrm4_init_tempsel(struct xfrm_state *x, struct flowi *fl,
		     struct xfrm_tmpl *tmpl,
		     xfrm_address_t *daddr, xfrm_address_t *saddr)
{
	x->sel.daddr.a4 = fl->fl4_dst;
	x->sel.saddr.a4 = fl->fl4_src;
	x->sel.dport = xfrm_flowi_dport(fl);
	x->sel.dport_mask = ~0;
	x->sel.sport = xfrm_flowi_sport(fl);
	x->sel.sport_mask = ~0;
	x->sel.prefixlen_d = 32;
	x->sel.prefixlen_s = 32;
	x->sel.proto = fl->proto;
	x->sel.ifindex = fl->oif;
	x->id = tmpl->id;
	if (x->id.daddr.a4 == 0)
		x->id.daddr.a4 = daddr->a4;
	x->props.saddr = tmpl->saddr;
	if (x->props.saddr.a4 == 0)
		x->props.saddr.a4 = saddr->a4;
	if (tmpl->mode && x->props.saddr.a4 == 0) {
		struct rtable *rt;
	        struct flowi fl_tunnel = {
        	        .nl_u = {
        			.ip4_u = {
					.daddr = x->id.daddr.a4,
				}
			}
		};
		if (!xfrm_dst_lookup((struct xfrm_dst **)&rt,
		                     &fl_tunnel, AF_INET)) {
			x->props.saddr.a4 = rt->rt_src;
			dst_release(&rt->u.dst);
		}
	}
	x->props.mode = tmpl->mode;
	x->props.reqid = tmpl->reqid;
	x->props.family = AF_INET;
}

static struct xfrm_state *
__xfrm4_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto)
{
	unsigned h = __xfrm4_spi_hash(daddr, spi, proto);
	struct xfrm_state *x;

	list_for_each_entry(x, xfrm4_state_afinfo.state_byspi+h, byspi) {
		if (x->props.family == AF_INET &&
		    spi == x->id.spi &&
		    daddr->a4 == x->id.daddr.a4 &&
		    proto == x->id.proto) {
			xfrm_state_hold(x);
			return x;
		}
	}
	return NULL;
}

static struct xfrm_state *
__xfrm4_find_acq(u8 mode, u32 reqid, u8 proto, 
		 xfrm_address_t *daddr, xfrm_address_t *saddr, 
		 int create)
{
	struct xfrm_state *x, *x0;
	unsigned h = __xfrm4_dst_hash(daddr);

	x0 = NULL;

	list_for_each_entry(x, xfrm4_state_afinfo.state_bydst+h, bydst) {
		if (x->props.family == AF_INET &&
		    daddr->a4 == x->id.daddr.a4 &&
		    mode == x->props.mode &&
		    proto == x->id.proto &&
		    saddr->a4 == x->props.saddr.a4 &&
		    reqid == x->props.reqid &&
		    x->km.state == XFRM_STATE_ACQ &&
		    !x->id.spi) {
			    x0 = x;
			    break;
		    }
	}
	if (!x0 && create && (x0 = xfrm_state_alloc()) != NULL) {
		x0->sel.daddr.a4 = daddr->a4;
		x0->sel.saddr.a4 = saddr->a4;
		x0->sel.prefixlen_d = 32;
		x0->sel.prefixlen_s = 32;
		x0->props.saddr.a4 = saddr->a4;
		x0->km.state = XFRM_STATE_ACQ;
		x0->id.daddr.a4 = daddr->a4;
		x0->id.proto = proto;
		x0->props.family = AF_INET;
		x0->props.mode = mode;
		x0->props.reqid = reqid;
		x0->props.family = AF_INET;
		x0->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES;
		xfrm_state_hold(x0);
		x0->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ;
		add_timer(&x0->timer);
		xfrm_state_hold(x0);
		list_add_tail(&x0->bydst, xfrm4_state_afinfo.state_bydst+h);
		wake_up(&km_waitq);
	}
	if (x0)
		xfrm_state_hold(x0);
	return x0;
}

static struct xfrm_state_afinfo xfrm4_state_afinfo = {
	.family			= AF_INET,
	.init_flags		= xfrm4_init_flags,
	.init_tempsel		= __xfrm4_init_tempsel,
	.state_lookup		= __xfrm4_state_lookup,
	.find_acq		= __xfrm4_find_acq,
};

void __init xfrm4_state_init(void)
{
	xfrm_state_register_afinfo(&xfrm4_state_afinfo);
}

#if 0
void __exit xfrm4_state_fini(void)
{
	xfrm_state_unregister_afinfo(&xfrm4_state_afinfo);
}
#endif  /*  0  */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* xfrm4_state.c
	3	*
	4	* Changes:
	5	* YOSHIFUJI Hideaki @USAGI
	6	* Split up af-specific portion
	7	*
	8	*/
	9
dd87147e	10	#include <net/ip.h>
1da177e4 LT	11	#include <net/xfrm.h>
	12	#include <linux/pfkeyv2.h>
	13	#include <linux/ipsec.h>
	14
	15	static struct xfrm_state_afinfo xfrm4_state_afinfo;
	16
dd87147e HX	17	static int xfrm4_init_flags(struct xfrm_state *x)
	18	{
	19	if (ipv4_config.no_pmtu_disc)
	20	x->props.flags \|= XFRM_STATE_NOPMTUDISC;
	21	return 0;
	22	}
	23
1da177e4 LT	24	static void
	25	__xfrm4_init_tempsel(struct xfrm_state x, struct flowi fl,
	26	struct xfrm_tmpl *tmpl,
	27	xfrm_address_t daddr, xfrm_address_t saddr)
	28	{
	29	x->sel.daddr.a4 = fl->fl4_dst;
	30	x->sel.saddr.a4 = fl->fl4_src;
	31	x->sel.dport = xfrm_flowi_dport(fl);
	32	x->sel.dport_mask = ~0;
	33	x->sel.sport = xfrm_flowi_sport(fl);
	34	x->sel.sport_mask = ~0;
	35	x->sel.prefixlen_d = 32;
	36	x->sel.prefixlen_s = 32;
	37	x->sel.proto = fl->proto;
	38	x->sel.ifindex = fl->oif;
	39	x->id = tmpl->id;
	40	if (x->id.daddr.a4 == 0)
	41	x->id.daddr.a4 = daddr->a4;
	42	x->props.saddr = tmpl->saddr;
	43	if (x->props.saddr.a4 == 0)
	44	x->props.saddr.a4 = saddr->a4;
ee51b1b6 PM	45	if (tmpl->mode && x->props.saddr.a4 == 0) {
	46	struct rtable *rt;
	47	struct flowi fl_tunnel = {
	48	.nl_u = {
	49	.ip4_u = {
	50	.daddr = x->id.daddr.a4,
	51	}
	52	}
	53	};
	54	if (!xfrm_dst_lookup((struct xfrm_dst **)&rt,
	55	&fl_tunnel, AF_INET)) {
	56	x->props.saddr.a4 = rt->rt_src;
	57	dst_release(&rt->u.dst);
	58	}
	59	}
1da177e4 LT	60	x->props.mode = tmpl->mode;
	61	x->props.reqid = tmpl->reqid;
	62	x->props.family = AF_INET;
	63	}
	64
	65	static struct xfrm_state *
	66	__xfrm4_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto)
	67	{
	68	unsigned h = __xfrm4_spi_hash(daddr, spi, proto);
	69	struct xfrm_state *x;
	70
	71	list_for_each_entry(x, xfrm4_state_afinfo.state_byspi+h, byspi) {
	72	if (x->props.family == AF_INET &&
	73	spi == x->id.spi &&
	74	daddr->a4 == x->id.daddr.a4 &&
	75	proto == x->id.proto) {
	76	xfrm_state_hold(x);
	77	return x;
	78	}
	79	}
	80	return NULL;
	81	}
	82
	83	static struct xfrm_state *
	84	__xfrm4_find_acq(u8 mode, u32 reqid, u8 proto,
	85	xfrm_address_t daddr, xfrm_address_t saddr,
	86	int create)
	87	{
	88	struct xfrm_state x, x0;
	89	unsigned h = __xfrm4_dst_hash(daddr);
	90
	91	x0 = NULL;
	92
	93	list_for_each_entry(x, xfrm4_state_afinfo.state_bydst+h, bydst) {
	94	if (x->props.family == AF_INET &&
	95	daddr->a4 == x->id.daddr.a4 &&
	96	mode == x->props.mode &&
	97	proto == x->id.proto &&
	98	saddr->a4 == x->props.saddr.a4 &&
	99	reqid == x->props.reqid &&
	100	x->km.state == XFRM_STATE_ACQ &&
	101	!x->id.spi) {
	102	x0 = x;
	103	break;
	104	}
	105	}
	106	if (!x0 && create && (x0 = xfrm_state_alloc()) != NULL) {
	107	x0->sel.daddr.a4 = daddr->a4;
	108	x0->sel.saddr.a4 = saddr->a4;
	109	x0->sel.prefixlen_d = 32;
	110	x0->sel.prefixlen_s = 32;
	111	x0->props.saddr.a4 = saddr->a4;
	112	x0->km.state = XFRM_STATE_ACQ;
	113	x0->id.daddr.a4 = daddr->a4;
	114	x0->id.proto = proto;
	115	x0->props.family = AF_INET;
	116	x0->props.mode = mode;
	117	x0->props.reqid = reqid;
	118	x0->props.family = AF_INET;
	119	x0->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES;
	120	xfrm_state_hold(x0);
	121	x0->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ;
	122	add_timer(&x0->timer);
	123	xfrm_state_hold(x0);
124	list_add_tail(&x0->bydst, xfrm4_state_afinfo.state_bydst+h);
125	wake_up(&km_waitq);
126	}
127	if (x0)
128	xfrm_state_hold(x0);
129	return x0;
130	}
131
132	static struct xfrm_state_afinfo xfrm4_state_afinfo = {
133	.family = AF_INET,
dd87147e	134	.init_flags = xfrm4_init_flags,
1da177e4 LT	135	.init_tempsel = __xfrm4_init_tempsel,
	136	.state_lookup = __xfrm4_state_lookup,
	137	.find_acq = __xfrm4_find_acq,
	138	};
	139
	140	void __init xfrm4_state_init(void)
	141	{
	142	xfrm_state_register_afinfo(&xfrm4_state_afinfo);
	143	}
	144
0742fd53	145	#if 0
1da177e4 LT	146	void __exit xfrm4_state_fini(void)
	147	{
	148	xfrm_state_unregister_afinfo(&xfrm4_state_afinfo);
	149	}
0742fd53	150	#endif /* 0 */
1da177e4	151