[deliverable/linux.git] / net / ipv6 / ila / ila_lwt.c

#include <linux/errno.h>
#include <linux/ip.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/socket.h>
#include <linux/types.h>
#include <net/checksum.h>
#include <net/ip.h>
#include <net/ip6_fib.h>
#include <net/lwtunnel.h>
#include <net/protocol.h>
#include <uapi/linux/ila.h>
#include "ila.h"

static inline struct ila_params *ila_params_lwtunnel(
	struct lwtunnel_state *lwstate)
{
	return (struct ila_params *)lwstate->data;
}

static int ila_output(struct net *net, struct sock *sk, struct sk_buff *skb)
{
	struct dst_entry *dst = skb_dst(skb);

	if (skb->protocol != htons(ETH_P_IPV6))
		goto drop;

	update_ipv6_locator(skb, ila_params_lwtunnel(dst->lwtstate));

	return dst->lwtstate->orig_output(net, sk, skb);

drop:
	kfree_skb(skb);
	return -EINVAL;
}

static int ila_input(struct sk_buff *skb)
{
	struct dst_entry *dst = skb_dst(skb);

	if (skb->protocol != htons(ETH_P_IPV6))
		goto drop;

	update_ipv6_locator(skb, ila_params_lwtunnel(dst->lwtstate));

	return dst->lwtstate->orig_input(skb);

drop:
	kfree_skb(skb);
	return -EINVAL;
}

static struct nla_policy ila_nl_policy[ILA_ATTR_MAX + 1] = {
	[ILA_ATTR_LOCATOR] = { .type = NLA_U64, },
};

static int ila_build_state(struct net_device *dev, struct nlattr *nla,
			   unsigned int family, const void *cfg,
			   struct lwtunnel_state **ts)
{
	struct ila_params *p;
	struct nlattr *tb[ILA_ATTR_MAX + 1];
	size_t encap_len = sizeof(*p);
	struct lwtunnel_state *newts;
	const struct fib6_config *cfg6 = cfg;
	int ret;

	if (family != AF_INET6)
		return -EINVAL;

	ret = nla_parse_nested(tb, ILA_ATTR_MAX, nla,
			       ila_nl_policy);
	if (ret < 0)
		return ret;

	if (!tb[ILA_ATTR_LOCATOR])
		return -EINVAL;

	newts = lwtunnel_state_alloc(encap_len);
	if (!newts)
		return -ENOMEM;

	newts->len = encap_len;
	p = ila_params_lwtunnel(newts);

	p->locator = (__force __be64)nla_get_u64(tb[ILA_ATTR_LOCATOR]);

	if (cfg6->fc_dst_len > sizeof(__be64)) {
		/* Precompute checksum difference for translation since we
		 * know both the old locator and the new one.
		 */
		p->locator_match = *(__be64 *)&cfg6->fc_dst;
		p->csum_diff = compute_csum_diff8(
			(__be32 *)&p->locator_match, (__be32 *)&p->locator);
	}

	newts->type = LWTUNNEL_ENCAP_ILA;
	newts->flags |= LWTUNNEL_STATE_OUTPUT_REDIRECT |
			LWTUNNEL_STATE_INPUT_REDIRECT;

	*ts = newts;

	return 0;
}

static int ila_fill_encap_info(struct sk_buff *skb,
			       struct lwtunnel_state *lwtstate)
{
	struct ila_params *p = ila_params_lwtunnel(lwtstate);

	if (nla_put_u64(skb, ILA_ATTR_LOCATOR, (__force u64)p->locator))
		goto nla_put_failure;

	return 0;

nla_put_failure:
	return -EMSGSIZE;
}

static int ila_encap_nlsize(struct lwtunnel_state *lwtstate)
{
	/* No encapsulation overhead */
	return 0;
}

static int ila_encap_cmp(struct lwtunnel_state *a, struct lwtunnel_state *b)
{
	struct ila_params *a_p = ila_params_lwtunnel(a);
	struct ila_params *b_p = ila_params_lwtunnel(b);

	return (a_p->locator != b_p->locator);
}

static const struct lwtunnel_encap_ops ila_encap_ops = {
	.build_state = ila_build_state,
	.output = ila_output,
	.input = ila_input,
	.fill_encap = ila_fill_encap_info,
	.get_encap_size = ila_encap_nlsize,
	.cmp_encap = ila_encap_cmp,
};

int ila_lwt_init(void)
{
	return lwtunnel_encap_add_ops(&ila_encap_ops, LWTUNNEL_ENCAP_ILA);
}

void ila_lwt_fini(void)
{
	lwtunnel_encap_del_ops(&ila_encap_ops, LWTUNNEL_ENCAP_ILA);
}
Commit	Line	Data
65d7ab8d TH	1	#include <linux/errno.h>
	2	#include <linux/ip.h>
	3	#include <linux/kernel.h>
	4	#include <linux/module.h>
	5	#include <linux/skbuff.h>
	6	#include <linux/socket.h>
	7	#include <linux/types.h>
	8	#include <net/checksum.h>
	9	#include <net/ip.h>
	10	#include <net/ip6_fib.h>
	11	#include <net/lwtunnel.h>
	12	#include <net/protocol.h>
	13	#include <uapi/linux/ila.h>
33f11d16	14	#include "ila.h"
65d7ab8d TH	15
	16	static inline struct ila_params *ila_params_lwtunnel(
	17	struct lwtunnel_state *lwstate)
	18	{
	19	return (struct ila_params *)lwstate->data;
	20	}
	21
ede2059d	22	static int ila_output(struct net net, struct sock sk, struct sk_buff *skb)
65d7ab8d TH	23	{
65d7ab8d TH	24	struct dst_entry *dst = skb_dst(skb);
65d7ab8d TH	25
	26	if (skb->protocol != htons(ETH_P_IPV6))
	27	goto drop;
	28
61adedf3	29	update_ipv6_locator(skb, ila_params_lwtunnel(dst->lwtstate));
65d7ab8d	30
ede2059d	31	return dst->lwtstate->orig_output(net, sk, skb);
65d7ab8d TH	32
	33	drop:
	34	kfree_skb(skb);
	35	return -EINVAL;
	36	}
	37
	38	static int ila_input(struct sk_buff *skb)
	39	{
	40	struct dst_entry *dst = skb_dst(skb);
65d7ab8d TH	41
	42	if (skb->protocol != htons(ETH_P_IPV6))
	43	goto drop;
	44
61adedf3	45	update_ipv6_locator(skb, ila_params_lwtunnel(dst->lwtstate));
65d7ab8d	46
61adedf3	47	return dst->lwtstate->orig_input(skb);
65d7ab8d TH	48
	49	drop:
	50	kfree_skb(skb);
	51	return -EINVAL;
	52	}
	53
	54	static struct nla_policy ila_nl_policy[ILA_ATTR_MAX + 1] = {
	55	[ILA_ATTR_LOCATOR] = { .type = NLA_U64, },
	56	};
	57
	58	static int ila_build_state(struct net_device dev, struct nlattr nla,
127eb7cd	59	unsigned int family, const void *cfg,
65d7ab8d TH	60	struct lwtunnel_state **ts)
	61	{
	62	struct ila_params *p;
	63	struct nlattr *tb[ILA_ATTR_MAX + 1];
	64	size_t encap_len = sizeof(*p);
	65	struct lwtunnel_state *newts;
92b78aff	66	const struct fib6_config *cfg6 = cfg;
65d7ab8d TH	67	int ret;
65d7ab8d TH	68
92b78aff TH	69	if (family != AF_INET6)
	70	return -EINVAL;
	71
65d7ab8d TH	72	ret = nla_parse_nested(tb, ILA_ATTR_MAX, nla,
	73	ila_nl_policy);
	74	if (ret < 0)
	75	return ret;
	76
	77	if (!tb[ILA_ATTR_LOCATOR])
	78	return -EINVAL;
	79
	80	newts = lwtunnel_state_alloc(encap_len);
	81	if (!newts)
	82	return -ENOMEM;
	83
	84	newts->len = encap_len;
	85	p = ila_params_lwtunnel(newts);
	86
	87	p->locator = (__force __be64)nla_get_u64(tb[ILA_ATTR_LOCATOR]);
	88
92b78aff TH	89	if (cfg6->fc_dst_len > sizeof(__be64)) {
	90	/* Precompute checksum difference for translation since we
	91	* know both the old locator and the new one.
	92	*/
	93	p->locator_match = (__be64 )&cfg6->fc_dst;
	94	p->csum_diff = compute_csum_diff8(
	95	(__be32 )&p->locator_match, (__be32 )&p->locator);
	96	}
	97
65d7ab8d TH	98	newts->type = LWTUNNEL_ENCAP_ILA;
	99	newts->flags \|= LWTUNNEL_STATE_OUTPUT_REDIRECT \|
	100	LWTUNNEL_STATE_INPUT_REDIRECT;
	101
	102	*ts = newts;
	103
	104	return 0;
	105	}
	106
	107	static int ila_fill_encap_info(struct sk_buff *skb,
	108	struct lwtunnel_state *lwtstate)
	109	{
	110	struct ila_params *p = ila_params_lwtunnel(lwtstate);
	111
	112	if (nla_put_u64(skb, ILA_ATTR_LOCATOR, (__force u64)p->locator))
	113	goto nla_put_failure;
	114
	115	return 0;
	116
	117	nla_put_failure:
	118	return -EMSGSIZE;
	119	}
	120
	121	static int ila_encap_nlsize(struct lwtunnel_state *lwtstate)
	122	{
	123	/* No encapsulation overhead */
	124	return 0;
	125	}
	126
	127	static int ila_encap_cmp(struct lwtunnel_state a, struct lwtunnel_state b)
	128	{
	129	struct ila_params *a_p = ila_params_lwtunnel(a);
	130	struct ila_params *b_p = ila_params_lwtunnel(b);
	131
	132	return (a_p->locator != b_p->locator);
	133	}
	134
	135	static const struct lwtunnel_encap_ops ila_encap_ops = {
	136	.build_state = ila_build_state,
	137	.output = ila_output,
	138	.input = ila_input,
	139	.fill_encap = ila_fill_encap_info,
	140	.get_encap_size = ila_encap_nlsize,
	141	.cmp_encap = ila_encap_cmp,
	142	};
	143
33f11d16	144	int ila_lwt_init(void)
65d7ab8d TH	145	{
	146	return lwtunnel_encap_add_ops(&ila_encap_ops, LWTUNNEL_ENCAP_ILA);
	147	}
	148
33f11d16	149	void ila_lwt_fini(void)
65d7ab8d TH	150	{
	151	lwtunnel_encap_del_ops(&ila_encap_ops, LWTUNNEL_ENCAP_ILA);
	152	}