[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_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.family = AF_INET6;
	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;
}

/* 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,
	.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 LT	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);
79654a76	35	x->sel.family = AF_INET6;
1da177e4 LT	36	x->sel.prefixlen_d = 128;
	37	x->sel.prefixlen_s = 128;
	38	x->sel.proto = fl->proto;
	39	x->sel.ifindex = fl->oif;
	40	x->id = tmpl->id;
	41	if (ipv6_addr_any((struct in6_addr*)&x->id.daddr))
	42	memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr));
	43	memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr));
	44	if (ipv6_addr_any((struct in6_addr*)&x->props.saddr))
	45	memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr));
	46	x->props.mode = tmpl->mode;
	47	x->props.reqid = tmpl->reqid;
	48	x->props.family = AF_INET6;
	49	}
	50
3b6cdf94	51	/* distribution counting sort function for xfrm_state and xfrm_tmpl */
58c949d1	52	static int
3b6cdf94	53	__xfrm6_sort(void dst, void src, int n, int (cmp)(void p), int maxclass)
58c949d1 MN	54	{
58c949d1 MN	55	int i;
3b6cdf94 YH	56	int class[XFRM_MAX_DEPTH];
3b6cdf94 YH	57	int count[maxclass];
58c949d1	58
3b6cdf94	59	memset(count, 0, sizeof(count));
58c949d1	60
64d9fdda	61	for (i = 0; i < n; i++) {
3b6cdf94 YH	62	int c;
	63	class[i] = c = cmp(src[i]);
	64	count[c]++;
64d9fdda	65	}
58c949d1	66
3b6cdf94 YH	67	for (i = 2; i < maxclass; i++)
3b6cdf94 YH	68	count[i] += count[i - 1];
58c949d1	69
58c949d1	70	for (i = 0; i < n; i++) {
3b6cdf94	71	dst[count[class[i] - 1]++] = src[i];
66da8c52	72	src[i] = NULL;
58c949d1	73	}
58c949d1	74
58c949d1 MN	75	return 0;
	76	}
	77
3b6cdf94 YH	78	/*
	79	* Rule for xfrm_state:
	80	*
	81	* rule 1: select IPsec transport except AH
	82	* rule 2: select MIPv6 RO or inbound trigger
	83	* rule 3: select IPsec transport AH
	84	* rule 4: select IPsec tunnel
	85	* rule 5: others
	86	*/
	87	static int __xfrm6_state_sort_cmp(void *p)
58c949d1	88	{
3b6cdf94 YH	89	struct xfrm_state *v = p;
	90
	91	switch (v->props.mode) {
	92	case XFRM_MODE_TRANSPORT:
	93	if (v->id.proto != IPPROTO_AH)
	94	return 1;
	95	else
	96	return 3;
59fbb3a6	97	#if defined(CONFIG_IPV6_MIP6) \|\| defined(CONFIG_IPV6_MIP6_MODULE)
3b6cdf94 YH	98	case XFRM_MODE_ROUTEOPTIMIZATION:
	99	case XFRM_MODE_IN_TRIGGER:
	100	return 2;
64d9fdda	101	#endif
3b6cdf94 YH	102	case XFRM_MODE_TUNNEL:
	103	case XFRM_MODE_BEET:
	104	return 4;
58c949d1	105	}
3b6cdf94 YH	106	return 5;
3b6cdf94 YH	107	}
58c949d1	108
3b6cdf94 YH	109	static int
	110	__xfrm6_state_sort(struct xfrm_state dst, struct xfrm_state src, int n)
	111	{
	112	return __xfrm6_sort((void )dst, (void )src, n,
	113	__xfrm6_state_sort_cmp, 6);
	114	}
	115
	116	/*
	117	* Rule for xfrm_tmpl:
	118	*
	119	* rule 1: select IPsec transport
	120	* rule 2: select MIPv6 RO or inbound trigger
	121	* rule 3: select IPsec tunnel
	122	* rule 4: others
	123	*/
	124	static int __xfrm6_tmpl_sort_cmp(void *p)
	125	{
	126	struct xfrm_tmpl *v = p;
	127	switch (v->mode) {
	128	case XFRM_MODE_TRANSPORT:
	129	return 1;
	130	#if defined(CONFIG_IPV6_MIP6) \|\| defined(CONFIG_IPV6_MIP6_MODULE)
	131	case XFRM_MODE_ROUTEOPTIMIZATION:
	132	case XFRM_MODE_IN_TRIGGER:
	133	return 2;
	134	#endif
	135	case XFRM_MODE_TUNNEL:
	136	case XFRM_MODE_BEET:
	137	return 3;
58c949d1	138	}
3b6cdf94 YH	139	return 4;
3b6cdf94 YH	140	}
58c949d1	141
3b6cdf94 YH	142	static int
	143	__xfrm6_tmpl_sort(struct xfrm_tmpl dst, struct xfrm_tmpl src, int n)
	144	{
	145	return __xfrm6_sort((void )dst, (void )src, n,
	146	__xfrm6_tmpl_sort_cmp, 5);
58c949d1 MN	147	}
58c949d1 MN	148
36cf9acf HX	149	int xfrm6_extract_header(struct sk_buff *skb)
	150	{
	151	struct ipv6hdr *iph = ipv6_hdr(skb);
	152
732c8bd5	153	XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph);
36cf9acf HX	154	XFRM_MODE_SKB_CB(skb)->id = 0;
	155	XFRM_MODE_SKB_CB(skb)->frag_off = htons(IP_DF);
	156	XFRM_MODE_SKB_CB(skb)->tos = ipv6_get_dsfield(iph);
	157	XFRM_MODE_SKB_CB(skb)->ttl = iph->hop_limit;
732c8bd5	158	XFRM_MODE_SKB_CB(skb)->optlen = 0;
36cf9acf HX	159	memcpy(XFRM_MODE_SKB_CB(skb)->flow_lbl, iph->flow_lbl,
	160	sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
	161
	162	return 0;
	163	}
	164
1da177e4 LT	165	static struct xfrm_state_afinfo xfrm6_state_afinfo = {
1da177e4 LT	166	.family = AF_INET6,
36cf9acf	167	.proto = IPPROTO_IPV6,
227620e2	168	.eth_proto = htons(ETH_P_IPV6),
17c2a42a	169	.owner = THIS_MODULE,
1da177e4	170	.init_tempsel = __xfrm6_init_tempsel,
58c949d1 MN	171	.tmpl_sort = __xfrm6_tmpl_sort,
58c949d1 MN	172	.state_sort = __xfrm6_state_sort,
cdca7265	173	.output = xfrm6_output,
227620e2	174	.extract_input = xfrm6_extract_input,
36cf9acf	175	.extract_output = xfrm6_extract_output,
716062fd	176	.transport_finish = xfrm6_transport_finish,
1da177e4 LT	177	};
1da177e4 LT	178
0013caba	179	int __init xfrm6_state_init(void)
1da177e4	180	{
0013caba	181	return xfrm_state_register_afinfo(&xfrm6_state_afinfo);
1da177e4 LT	182	}
	183
	184	void xfrm6_state_fini(void)
	185	{
	186	xfrm_state_unregister_afinfo(&xfrm6_state_afinfo);
	187	}
	188