[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 <linux/netfilter_ipv6.h>
#include <net/dsfield.h>
#include <net/ipv6.h>
#include <net/addrconf.h>

static void
__xfrm6_init_tempsel(struct xfrm_selector *sel, struct flowi *fl)
{
	/* Initialize temporary selector matching only
	 * to current session. */
	ipv6_addr_copy((struct in6_addr *)&sel->daddr, &fl->fl6_dst);
	ipv6_addr_copy((struct in6_addr *)&sel->saddr, &fl->fl6_src);
	sel->dport = xfrm_flowi_dport(fl);
	sel->dport_mask = htons(0xffff);
	sel->sport = xfrm_flowi_sport(fl);
	sel->sport_mask = htons(0xffff);
	sel->family = AF_INET6;
	sel->prefixlen_d = 128;
	sel->prefixlen_s = 128;
	sel->proto = fl->proto;
	sel->ifindex = fl->oif;
}

static void
xfrm6_init_temprop(struct xfrm_state *x, struct xfrm_tmpl *tmpl,
		   xfrm_address_t *daddr, xfrm_address_t *saddr)
{
	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;
}

/* distribution counting sort function for xfrm_state and xfrm_tmpl */
static int
__xfrm6_sort(void **dst, void **src, int n, int (*cmp)(void *p), int maxclass)
{
	int i;
	int class[XFRM_MAX_DEPTH];
	int count[maxclass];

	memset(count, 0, sizeof(count));

	for (i = 0; i < n; i++) {
		int c;
		class[i] = c = cmp(src[i]);
		count[c]++;
	}

	for (i = 2; i < maxclass; i++)
		count[i] += count[i - 1];

	for (i = 0; i < n; i++) {
		dst[count[class[i] - 1]++] = src[i];
		src[i] = NULL;
	}

	return 0;
}

/*
 * Rule for xfrm_state:
 *
 * rule 1: select IPsec transport except AH
 * rule 2: select MIPv6 RO or inbound trigger
 * rule 3: select IPsec transport AH
 * rule 4: select IPsec tunnel
 * rule 5: others
 */
static int __xfrm6_state_sort_cmp(void *p)
{
	struct xfrm_state *v = p;

	switch (v->props.mode) {
	case XFRM_MODE_TRANSPORT:
		if (v->id.proto != IPPROTO_AH)
			return 1;
		else
			return 3;
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
	case XFRM_MODE_ROUTEOPTIMIZATION:
	case XFRM_MODE_IN_TRIGGER:
		return 2;
#endif
	case XFRM_MODE_TUNNEL:
	case XFRM_MODE_BEET:
		return 4;
	}
	return 5;
}

static int
__xfrm6_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n)
{
	return __xfrm6_sort((void **)dst, (void **)src, n,
			    __xfrm6_state_sort_cmp, 6);
}

/*
 * Rule for xfrm_tmpl:
 *
 * rule 1: select IPsec transport
 * rule 2: select MIPv6 RO or inbound trigger
 * rule 3: select IPsec tunnel
 * rule 4: others
 */
static int __xfrm6_tmpl_sort_cmp(void *p)
{
	struct xfrm_tmpl *v = p;
	switch (v->mode) {
	case XFRM_MODE_TRANSPORT:
		return 1;
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
	case XFRM_MODE_ROUTEOPTIMIZATION:
	case XFRM_MODE_IN_TRIGGER:
		return 2;
#endif
	case XFRM_MODE_TUNNEL:
	case XFRM_MODE_BEET:
		return 3;
	}
	return 4;
}

static int
__xfrm6_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n)
{
	return __xfrm6_sort((void **)dst, (void **)src, n,
			    __xfrm6_tmpl_sort_cmp, 5);
}

int xfrm6_extract_header(struct sk_buff *skb)
{
	struct ipv6hdr *iph = ipv6_hdr(skb);

	XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph);
	XFRM_MODE_SKB_CB(skb)->id = 0;
	XFRM_MODE_SKB_CB(skb)->frag_off = htons(IP_DF);
	XFRM_MODE_SKB_CB(skb)->tos = ipv6_get_dsfield(iph);
	XFRM_MODE_SKB_CB(skb)->ttl = iph->hop_limit;
	XFRM_MODE_SKB_CB(skb)->optlen = 0;
	memcpy(XFRM_MODE_SKB_CB(skb)->flow_lbl, iph->flow_lbl,
	       sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));

	return 0;
}

static struct xfrm_state_afinfo xfrm6_state_afinfo = {
	.family			= AF_INET6,
	.proto			= IPPROTO_IPV6,
	.eth_proto		= htons(ETH_P_IPV6),
	.owner			= THIS_MODULE,
	.init_tempsel		= __xfrm6_init_tempsel,
	.init_temprop		= xfrm6_init_temprop,
	.tmpl_sort		= __xfrm6_tmpl_sort,
	.state_sort		= __xfrm6_state_sort,
	.output			= xfrm6_output,
	.extract_input		= xfrm6_extract_input,
	.extract_output		= xfrm6_extract_output,
	.transport_finish	= xfrm6_transport_finish,
};

int __init xfrm6_state_init(void)
{
	return 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>
862b82c6	17	#include <linux/netfilter_ipv6.h>
36cf9acf	18	#include <net/dsfield.h>
1da177e4	19	#include <net/ipv6.h>
ee51b1b6	20	#include <net/addrconf.h>
1da177e4	21
1da177e4	22	static void
8444cf71	23	__xfrm6_init_tempsel(struct xfrm_selector sel, struct flowi fl)
1da177e4 LT	24	{
	25	/* Initialize temporary selector matching only
	26	* to current session. */
8444cf71 TE	27	ipv6_addr_copy((struct in6_addr *)&sel->daddr, &fl->fl6_dst);
	28	ipv6_addr_copy((struct in6_addr *)&sel->saddr, &fl->fl6_src);
	29	sel->dport = xfrm_flowi_dport(fl);
	30	sel->dport_mask = htons(0xffff);
	31	sel->sport = xfrm_flowi_sport(fl);
	32	sel->sport_mask = htons(0xffff);
	33	sel->family = AF_INET6;
	34	sel->prefixlen_d = 128;
	35	sel->prefixlen_s = 128;
	36	sel->proto = fl->proto;
	37	sel->ifindex = fl->oif;
	38	}
	39
	40	static void
	41	xfrm6_init_temprop(struct xfrm_state x, struct xfrm_tmpl tmpl,
	42	xfrm_address_t daddr, xfrm_address_t saddr)
	43	{
1da177e4 LT	44	x->id = tmpl->id;
	45	if (ipv6_addr_any((struct in6_addr*)&x->id.daddr))
	46	memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr));
	47	memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr));
	48	if (ipv6_addr_any((struct in6_addr*)&x->props.saddr))
	49	memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr));
	50	x->props.mode = tmpl->mode;
	51	x->props.reqid = tmpl->reqid;
	52	x->props.family = AF_INET6;
	53	}
	54
3b6cdf94	55	/* distribution counting sort function for xfrm_state and xfrm_tmpl */
58c949d1	56	static int
3b6cdf94	57	__xfrm6_sort(void dst, void src, int n, int (cmp)(void p), int maxclass)
58c949d1 MN	58	{
58c949d1 MN	59	int i;
3b6cdf94 YH	60	int class[XFRM_MAX_DEPTH];
3b6cdf94 YH	61	int count[maxclass];
58c949d1	62
3b6cdf94	63	memset(count, 0, sizeof(count));
58c949d1	64
64d9fdda	65	for (i = 0; i < n; i++) {
3b6cdf94 YH	66	int c;
	67	class[i] = c = cmp(src[i]);
	68	count[c]++;
64d9fdda	69	}
58c949d1	70
3b6cdf94 YH	71	for (i = 2; i < maxclass; i++)
3b6cdf94 YH	72	count[i] += count[i - 1];
58c949d1	73
58c949d1	74	for (i = 0; i < n; i++) {
3b6cdf94	75	dst[count[class[i] - 1]++] = src[i];
66da8c52	76	src[i] = NULL;
58c949d1	77	}
58c949d1	78
58c949d1 MN	79	return 0;
	80	}
	81
3b6cdf94 YH	82	/*
	83	* Rule for xfrm_state:
	84	*
	85	* rule 1: select IPsec transport except AH
	86	* rule 2: select MIPv6 RO or inbound trigger
	87	* rule 3: select IPsec transport AH
	88	* rule 4: select IPsec tunnel
	89	* rule 5: others
	90	*/
	91	static int __xfrm6_state_sort_cmp(void *p)
58c949d1	92	{
3b6cdf94 YH	93	struct xfrm_state *v = p;
	94
	95	switch (v->props.mode) {
	96	case XFRM_MODE_TRANSPORT:
	97	if (v->id.proto != IPPROTO_AH)
	98	return 1;
	99	else
	100	return 3;
59fbb3a6	101	#if defined(CONFIG_IPV6_MIP6) \|\| defined(CONFIG_IPV6_MIP6_MODULE)
3b6cdf94 YH	102	case XFRM_MODE_ROUTEOPTIMIZATION:
	103	case XFRM_MODE_IN_TRIGGER:
	104	return 2;
64d9fdda	105	#endif
3b6cdf94 YH	106	case XFRM_MODE_TUNNEL:
	107	case XFRM_MODE_BEET:
	108	return 4;
58c949d1	109	}
3b6cdf94 YH	110	return 5;
3b6cdf94 YH	111	}
58c949d1	112
3b6cdf94 YH	113	static int
	114	__xfrm6_state_sort(struct xfrm_state dst, struct xfrm_state src, int n)
	115	{
	116	return __xfrm6_sort((void )dst, (void )src, n,
	117	__xfrm6_state_sort_cmp, 6);
	118	}
	119
	120	/*
	121	* Rule for xfrm_tmpl:
	122	*
	123	* rule 1: select IPsec transport
	124	* rule 2: select MIPv6 RO or inbound trigger
	125	* rule 3: select IPsec tunnel
	126	* rule 4: others
	127	*/
	128	static int __xfrm6_tmpl_sort_cmp(void *p)
	129	{
	130	struct xfrm_tmpl *v = p;
	131	switch (v->mode) {
	132	case XFRM_MODE_TRANSPORT:
	133	return 1;
	134	#if defined(CONFIG_IPV6_MIP6) \|\| defined(CONFIG_IPV6_MIP6_MODULE)
	135	case XFRM_MODE_ROUTEOPTIMIZATION:
	136	case XFRM_MODE_IN_TRIGGER:
	137	return 2;
	138	#endif
	139	case XFRM_MODE_TUNNEL:
	140	case XFRM_MODE_BEET:
	141	return 3;
58c949d1	142	}
3b6cdf94 YH	143	return 4;
3b6cdf94 YH	144	}
58c949d1	145
3b6cdf94 YH	146	static int
	147	__xfrm6_tmpl_sort(struct xfrm_tmpl dst, struct xfrm_tmpl src, int n)
	148	{
	149	return __xfrm6_sort((void )dst, (void )src, n,
	150	__xfrm6_tmpl_sort_cmp, 5);
58c949d1 MN	151	}
58c949d1 MN	152
36cf9acf HX	153	int xfrm6_extract_header(struct sk_buff *skb)
	154	{
	155	struct ipv6hdr *iph = ipv6_hdr(skb);
	156
732c8bd5	157	XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph);
36cf9acf HX	158	XFRM_MODE_SKB_CB(skb)->id = 0;
	159	XFRM_MODE_SKB_CB(skb)->frag_off = htons(IP_DF);
	160	XFRM_MODE_SKB_CB(skb)->tos = ipv6_get_dsfield(iph);
	161	XFRM_MODE_SKB_CB(skb)->ttl = iph->hop_limit;
732c8bd5	162	XFRM_MODE_SKB_CB(skb)->optlen = 0;
36cf9acf HX	163	memcpy(XFRM_MODE_SKB_CB(skb)->flow_lbl, iph->flow_lbl,
	164	sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
	165
	166	return 0;
	167	}
	168
1da177e4 LT	169	static struct xfrm_state_afinfo xfrm6_state_afinfo = {
1da177e4 LT	170	.family = AF_INET6,
36cf9acf	171	.proto = IPPROTO_IPV6,
227620e2	172	.eth_proto = htons(ETH_P_IPV6),
17c2a42a	173	.owner = THIS_MODULE,
1da177e4	174	.init_tempsel = __xfrm6_init_tempsel,
8444cf71	175	.init_temprop = xfrm6_init_temprop,
58c949d1 MN	176	.tmpl_sort = __xfrm6_tmpl_sort,
58c949d1 MN	177	.state_sort = __xfrm6_state_sort,
cdca7265	178	.output = xfrm6_output,
227620e2	179	.extract_input = xfrm6_extract_input,
36cf9acf	180	.extract_output = xfrm6_extract_output,
716062fd	181	.transport_finish = xfrm6_transport_finish,
1da177e4 LT	182	};
1da177e4 LT	183
0013caba	184	int __init xfrm6_state_init(void)
1da177e4	185	{
0013caba	186	return xfrm_state_register_afinfo(&xfrm6_state_afinfo);
1da177e4 LT	187	}
	188
	189	void xfrm6_state_fini(void)
	190	{
	191	xfrm_state_unregister_afinfo(&xfrm6_state_afinfo);
	192	}
	193