[net-next-2.6.git] / net / ipv6 / xfrm6_state.c

/*
 * xfrm6_state.c: based on xfrm4_state.c
 *
 * Authors:
 *	Mitsuru KANDA @USAGI
 * 	Kazunori MIYAZAWA @USAGI
 * 	Kunihiro Ishiguro <kunihiro@ipinfusion.com>
 * 		IPv6 support
 * 	YOSHIFUJI Hideaki @USAGI
 * 		Split up af-specific portion
 *
 */

#include <net/xfrm.h>
#include <linux/pfkeyv2.h>
#include <linux/ipsec.h>
#include <net/ipv6.h>
#include <net/addrconf.h>

static struct xfrm_state_afinfo xfrm6_state_afinfo;

static void
__xfrm6_init_tempsel(struct xfrm_state *x, struct flowi *fl,
		     struct xfrm_tmpl *tmpl,
		     xfrm_address_t *daddr, xfrm_address_t *saddr)
{
	/* Initialize temporary selector matching only
	 * to current session. */
	ipv6_addr_copy((struct in6_addr *)&x->sel.daddr, &fl->fl6_dst);
	ipv6_addr_copy((struct in6_addr *)&x->sel.saddr, &fl->fl6_src);
	x->sel.dport = xfrm_flowi_dport(fl);
	x->sel.dport_mask = htons(0xffff);
	x->sel.sport = xfrm_flowi_sport(fl);
	x->sel.sport_mask = htons(0xffff);
	x->sel.prefixlen_d = 128;
	x->sel.prefixlen_s = 128;
	x->sel.proto = fl->proto;
	x->sel.ifindex = fl->oif;
	x->id = tmpl->id;
	if (ipv6_addr_any((struct in6_addr*)&x->id.daddr))
		memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr));
	memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr));
	if (ipv6_addr_any((struct in6_addr*)&x->props.saddr))
		memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr));
	x->props.mode = tmpl->mode;
	x->props.reqid = tmpl->reqid;
	x->props.family = AF_INET6;
}

static int
__xfrm6_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n)
{
	int i;
	int j = 0;

	/* Rule 1: select IPsec transport except AH */
	for (i = 0; i < n; i++) {
		if (src[i]->props.mode == XFRM_MODE_TRANSPORT &&
		    src[i]->id.proto != IPPROTO_AH) {
			dst[j++] = src[i];
			src[i] = NULL;
		}
	}
	if (j == n)
		goto end;

	/* Rule 2: select MIPv6 RO or inbound trigger */
#ifdef CONFIG_IPV6_MIP6
	for (i = 0; i < n; i++) {
		if (src[i] &&
		    (src[i]->props.mode == XFRM_MODE_ROUTEOPTIMIZATION ||
		     src[i]->props.mode == XFRM_MODE_IN_TRIGGER)) {
			dst[j++] = src[i];
			src[i] = NULL;
		}
	}
	if (j == n)
		goto end;
#endif

	/* Rule 3: select IPsec transport AH */
	for (i = 0; i < n; i++) {
		if (src[i] &&
		    src[i]->props.mode == XFRM_MODE_TRANSPORT &&
		    src[i]->id.proto == IPPROTO_AH) {
			dst[j++] = src[i];
			src[i] = NULL;
		}
	}
	if (j == n)
		goto end;

	/* Rule 4: select IPsec tunnel */
	for (i = 0; i < n; i++) {
		if (src[i] &&
		    src[i]->props.mode == XFRM_MODE_TUNNEL) {
			dst[j++] = src[i];
			src[i] = NULL;
		}
	}
	if (likely(j == n))
		goto end;

	/* Final rule */
	for (i = 0; i < n; i++) {
		if (src[i]) {
			dst[j++] = src[i];
			src[i] = NULL;
		}
	}

 end:
	return 0;
}

static int
__xfrm6_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n)
{
	int i;
	int j = 0;

	/* Rule 1: select IPsec transport */
	for (i = 0; i < n; i++) {
		if (src[i]->mode == XFRM_MODE_TRANSPORT) {
			dst[j++] = src[i];
			src[i] = NULL;
		}
	}
	if (j == n)
		goto end;

	/* Rule 2: select MIPv6 RO or inbound trigger */
#ifdef CONFIG_IPV6_MIP6
	for (i = 0; i < n; i++) {
		if (src[i] &&
		    (src[i]->mode == XFRM_MODE_ROUTEOPTIMIZATION ||
		     src[i]->mode == XFRM_MODE_IN_TRIGGER)) {
			dst[j++] = src[i];
			src[i] = NULL;
		}
	}
	if (j == n)
		goto end;
#endif

	/* Rule 3: select IPsec tunnel */
	for (i = 0; i < n; i++) {
		if (src[i] &&
		    src[i]->mode == XFRM_MODE_TUNNEL) {
			dst[j++] = src[i];
			src[i] = NULL;
		}
	}
	if (likely(j == n))
		goto end;

	/* Final rule */
	for (i = 0; i < n; i++) {
		if (src[i]) {
			dst[j++] = src[i];
			src[i] = NULL;
		}
	}

 end:
	return 0;
}

static struct xfrm_state_afinfo xfrm6_state_afinfo = {
	.family			= AF_INET6,
	.init_tempsel		= __xfrm6_init_tempsel,
	.tmpl_sort		= __xfrm6_tmpl_sort,
	.state_sort		= __xfrm6_state_sort,
	.output			= xfrm6_output,
};

void __init xfrm6_state_init(void)
{
	xfrm_state_register_afinfo(&xfrm6_state_afinfo);
}

void xfrm6_state_fini(void)
{
	xfrm_state_unregister_afinfo(&xfrm6_state_afinfo);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* xfrm6_state.c: based on xfrm4_state.c
	3	*
	4	* Authors:
	5	* Mitsuru KANDA @USAGI
	6	* Kazunori MIYAZAWA @USAGI
	7	* Kunihiro Ishiguro <kunihiro@ipinfusion.com>
	8	* IPv6 support
	9	* YOSHIFUJI Hideaki @USAGI
	10	* Split up af-specific portion
1ab1457c	11	*
1da177e4 LT	12	*/
	13
	14	#include <net/xfrm.h>
	15	#include <linux/pfkeyv2.h>
	16	#include <linux/ipsec.h>
	17	#include <net/ipv6.h>
ee51b1b6	18	#include <net/addrconf.h>
1da177e4 LT	19
	20	static struct xfrm_state_afinfo xfrm6_state_afinfo;
	21
	22	static void
	23	__xfrm6_init_tempsel(struct xfrm_state x, struct flowi fl,
	24	struct xfrm_tmpl *tmpl,
	25	xfrm_address_t daddr, xfrm_address_t saddr)
	26	{
	27	/* Initialize temporary selector matching only
	28	* to current session. */
	29	ipv6_addr_copy((struct in6_addr *)&x->sel.daddr, &fl->fl6_dst);
	30	ipv6_addr_copy((struct in6_addr *)&x->sel.saddr, &fl->fl6_src);
	31	x->sel.dport = xfrm_flowi_dport(fl);
8f83f23e	32	x->sel.dport_mask = htons(0xffff);
1da177e4	33	x->sel.sport = xfrm_flowi_sport(fl);
8f83f23e	34	x->sel.sport_mask = htons(0xffff);
1da177e4 LT	35	x->sel.prefixlen_d = 128;
	36	x->sel.prefixlen_s = 128;
	37	x->sel.proto = fl->proto;
	38	x->sel.ifindex = fl->oif;
	39	x->id = tmpl->id;
	40	if (ipv6_addr_any((struct in6_addr*)&x->id.daddr))
	41	memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr));
	42	memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr));
	43	if (ipv6_addr_any((struct in6_addr*)&x->props.saddr))
	44	memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr));
	45	x->props.mode = tmpl->mode;
	46	x->props.reqid = tmpl->reqid;
	47	x->props.family = AF_INET6;
	48	}
	49
58c949d1 MN	50	static int
	51	__xfrm6_state_sort(struct xfrm_state dst, struct xfrm_state src, int n)
	52	{
	53	int i;
	54	int j = 0;
	55
	56	/* Rule 1: select IPsec transport except AH */
	57	for (i = 0; i < n; i++) {
	58	if (src[i]->props.mode == XFRM_MODE_TRANSPORT &&
	59	src[i]->id.proto != IPPROTO_AH) {
	60	dst[j++] = src[i];
	61	src[i] = NULL;
	62	}
	63	}
	64	if (j == n)
	65	goto end;
	66
64d9fdda MN	67	/* Rule 2: select MIPv6 RO or inbound trigger */
	68	#ifdef CONFIG_IPV6_MIP6
	69	for (i = 0; i < n; i++) {
	70	if (src[i] &&
	71	(src[i]->props.mode == XFRM_MODE_ROUTEOPTIMIZATION \|\|
	72	src[i]->props.mode == XFRM_MODE_IN_TRIGGER)) {
	73	dst[j++] = src[i];
	74	src[i] = NULL;
	75	}
	76	}
	77	if (j == n)
	78	goto end;
	79	#endif
58c949d1 MN	80
	81	/* Rule 3: select IPsec transport AH */
	82	for (i = 0; i < n; i++) {
	83	if (src[i] &&
	84	src[i]->props.mode == XFRM_MODE_TRANSPORT &&
	85	src[i]->id.proto == IPPROTO_AH) {
	86	dst[j++] = src[i];
	87	src[i] = NULL;
	88	}
	89	}
	90	if (j == n)
	91	goto end;
	92
	93	/* Rule 4: select IPsec tunnel */
	94	for (i = 0; i < n; i++) {
	95	if (src[i] &&
	96	src[i]->props.mode == XFRM_MODE_TUNNEL) {
	97	dst[j++] = src[i];
	98	src[i] = NULL;
	99	}
	100	}
	101	if (likely(j == n))
	102	goto end;
	103
	104	/* Final rule */
	105	for (i = 0; i < n; i++) {
	106	if (src[i]) {
	107	dst[j++] = src[i];
	108	src[i] = NULL;
	109	}
	110	}
	111
	112	end:
	113	return 0;
	114	}
	115
	116	static int
	117	__xfrm6_tmpl_sort(struct xfrm_tmpl dst, struct xfrm_tmpl src, int n)
	118	{
	119	int i;
	120	int j = 0;
	121
	122	/* Rule 1: select IPsec transport */
	123	for (i = 0; i < n; i++) {
	124	if (src[i]->mode == XFRM_MODE_TRANSPORT) {
	125	dst[j++] = src[i];
	126	src[i] = NULL;
	127	}
	128	}
	129	if (j == n)
	130	goto end;
	131
64d9fdda MN	132	/* Rule 2: select MIPv6 RO or inbound trigger */
	133	#ifdef CONFIG_IPV6_MIP6
	134	for (i = 0; i < n; i++) {
	135	if (src[i] &&
	136	(src[i]->mode == XFRM_MODE_ROUTEOPTIMIZATION \|\|
	137	src[i]->mode == XFRM_MODE_IN_TRIGGER)) {
	138	dst[j++] = src[i];
	139	src[i] = NULL;
	140	}
	141	}
	142	if (j == n)
	143	goto end;
	144	#endif
58c949d1 MN	145
	146	/* Rule 3: select IPsec tunnel */
	147	for (i = 0; i < n; i++) {
	148	if (src[i] &&
	149	src[i]->mode == XFRM_MODE_TUNNEL) {
	150	dst[j++] = src[i];
	151	src[i] = NULL;
	152	}
	153	}
	154	if (likely(j == n))
	155	goto end;
	156
	157	/* Final rule */
	158	for (i = 0; i < n; i++) {
	159	if (src[i]) {
	160	dst[j++] = src[i];
	161	src[i] = NULL;
	162	}
	163	}
	164
	165	end:
	166	return 0;
	167	}
	168
1da177e4 LT	169	static struct xfrm_state_afinfo xfrm6_state_afinfo = {
1da177e4 LT	170	.family = AF_INET6,
1da177e4	171	.init_tempsel = __xfrm6_init_tempsel,
58c949d1 MN	172	.tmpl_sort = __xfrm6_tmpl_sort,
58c949d1 MN	173	.state_sort = __xfrm6_state_sort,
cdca7265	174	.output = xfrm6_output,
1da177e4 LT	175	};
	176
	177	void __init xfrm6_state_init(void)
	178	{
	179	xfrm_state_register_afinfo(&xfrm6_state_afinfo);
	180	}
	181
	182	void xfrm6_state_fini(void)
	183	{
	184	xfrm_state_unregister_afinfo(&xfrm6_state_afinfo);
	185	}
	186