[mirror_ubuntu-zesty-kernel.git] / include / net / ndisc.h

#ifndef _NDISC_H
#define _NDISC_H

/*
 *	ICMP codes for neighbour discovery messages
 */

#define NDISC_ROUTER_SOLICITATION	133
#define NDISC_ROUTER_ADVERTISEMENT	134
#define NDISC_NEIGHBOUR_SOLICITATION	135
#define NDISC_NEIGHBOUR_ADVERTISEMENT	136
#define NDISC_REDIRECT			137

/*
 * Router type: cross-layer information from link-layer to
 * IPv6 layer reported by certain link types (e.g., RFC4214).
 */
#define NDISC_NODETYPE_UNSPEC		0	/* unspecified (default) */
#define NDISC_NODETYPE_HOST		1	/* host or unauthorized router */
#define NDISC_NODETYPE_NODEFAULT	2	/* non-default router */
#define NDISC_NODETYPE_DEFAULT		3	/* default router */

/*
 *	ndisc options
 */

enum {
	__ND_OPT_PREFIX_INFO_END = 0,
	ND_OPT_SOURCE_LL_ADDR = 1,	/* RFC2461 */
	ND_OPT_TARGET_LL_ADDR = 2,	/* RFC2461 */
	ND_OPT_PREFIX_INFO = 3,		/* RFC2461 */
	ND_OPT_REDIRECT_HDR = 4,	/* RFC2461 */
	ND_OPT_MTU = 5,			/* RFC2461 */
	__ND_OPT_ARRAY_MAX,
	ND_OPT_ROUTE_INFO = 24,		/* RFC4191 */
	ND_OPT_RDNSS = 25,		/* RFC5006 */
	ND_OPT_DNSSL = 31,		/* RFC6106 */
	__ND_OPT_MAX
};

#define MAX_RTR_SOLICITATION_DELAY	HZ

#define ND_REACHABLE_TIME		(30*HZ)
#define ND_RETRANS_TIMER		HZ

#include <linux/compiler.h>
#include <linux/icmpv6.h>
#include <linux/in6.h>
#include <linux/types.h>
#include <linux/if_arp.h>
#include <linux/netdevice.h>
#include <linux/hash.h>

#include <net/neighbour.h>

struct ctl_table;
struct inet6_dev;
struct net_device;
struct net_proto_family;
struct sk_buff;

extern struct neigh_table nd_tbl;

struct nd_msg {
        struct icmp6hdr	icmph;
        struct in6_addr	target;
	__u8		opt[0];
};

struct rs_msg {
	struct icmp6hdr	icmph;
	__u8		opt[0];
};

struct ra_msg {
        struct icmp6hdr		icmph;
	__be32			reachable_time;
	__be32			retrans_timer;
};

struct rd_msg {
	struct icmp6hdr icmph;
	struct in6_addr	target;
	struct in6_addr	dest;
	__u8		opt[0];
};

struct nd_opt_hdr {
	__u8		nd_opt_type;
	__u8		nd_opt_len;
} __packed;

/* ND options */
struct ndisc_options {
	struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX];
#ifdef CONFIG_IPV6_ROUTE_INFO
	struct nd_opt_hdr *nd_opts_ri;
	struct nd_opt_hdr *nd_opts_ri_end;
#endif
	struct nd_opt_hdr *nd_useropts;
	struct nd_opt_hdr *nd_useropts_end;
};

#define nd_opts_src_lladdr	nd_opt_array[ND_OPT_SOURCE_LL_ADDR]
#define nd_opts_tgt_lladdr	nd_opt_array[ND_OPT_TARGET_LL_ADDR]
#define nd_opts_pi		nd_opt_array[ND_OPT_PREFIX_INFO]
#define nd_opts_pi_end		nd_opt_array[__ND_OPT_PREFIX_INFO_END]
#define nd_opts_rh		nd_opt_array[ND_OPT_REDIRECT_HDR]
#define nd_opts_mtu		nd_opt_array[ND_OPT_MTU]

#define NDISC_OPT_SPACE(len) (((len)+2+7)&~7)

struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
					  struct ndisc_options *ndopts);

/*
 * Return the padding between the option length and the start of the
 * link addr.  Currently only IP-over-InfiniBand needs this, although
 * if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may
 * also need a pad of 2.
 */
static inline int ndisc_addr_option_pad(unsigned short type)
{
	switch (type) {
	case ARPHRD_INFINIBAND: return 2;
	default:                return 0;
	}
}

static inline int ndisc_opt_addr_space(struct net_device *dev)
{
	return NDISC_OPT_SPACE(dev->addr_len +
			       ndisc_addr_option_pad(dev->type));
}

static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p,
				      struct net_device *dev)
{
	u8 *lladdr = (u8 *)(p + 1);
	int lladdrlen = p->nd_opt_len << 3;
	int prepad = ndisc_addr_option_pad(dev->type);
	if (lladdrlen != ndisc_opt_addr_space(dev))
		return NULL;
	return lladdr + prepad;
}

static inline u32 ndisc_hashfn(const void *pkey, const struct net_device *dev, __u32 *hash_rnd)
{
	const u32 *p32 = pkey;

	return (((p32[0] ^ hash32_ptr(dev)) * hash_rnd[0]) +
		(p32[1] * hash_rnd[1]) +
		(p32[2] * hash_rnd[2]) +
		(p32[3] * hash_rnd[3]));
}

static inline struct neighbour *__ipv6_neigh_lookup_noref(struct net_device *dev, const void *pkey)
{
	return ___neigh_lookup_noref(&nd_tbl, neigh_key_eq128, ndisc_hashfn, pkey, dev);
}

static inline struct neighbour *__ipv6_neigh_lookup(struct net_device *dev, const void *pkey)
{
	struct neighbour *n;

	rcu_read_lock_bh();
	n = __ipv6_neigh_lookup_noref(dev, pkey);
	if (n && !atomic_inc_not_zero(&n->refcnt))
		n = NULL;
	rcu_read_unlock_bh();

	return n;
}

int ndisc_init(void);
int ndisc_late_init(void);

void ndisc_late_cleanup(void);
void ndisc_cleanup(void);

int ndisc_rcv(struct sk_buff *skb);

void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh,
		   const struct in6_addr *solicit,
		   const struct in6_addr *daddr, const struct in6_addr *saddr,
		   struct sk_buff *oskb);

void ndisc_send_rs(struct net_device *dev,
		   const struct in6_addr *saddr, const struct in6_addr *daddr);
void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
		   const struct in6_addr *daddr,
		   const struct in6_addr *solicited_addr,
		   bool router, bool solicited, bool override, bool inc_opt);

void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target);

int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev,
		 int dir);


/*
 *	IGMP
 */
int igmp6_init(void);

void igmp6_cleanup(void);

int igmp6_event_query(struct sk_buff *skb);

int igmp6_event_report(struct sk_buff *skb);


#ifdef CONFIG_SYSCTL
int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write,
			       void __user *buffer, size_t *lenp, loff_t *ppos);
int ndisc_ifinfo_sysctl_strategy(struct ctl_table *ctl,
				 void __user *oldval, size_t __user *oldlenp,
				 void __user *newval, size_t newlen);
#endif

void inet6_ifinfo_notify(int event, struct inet6_dev *idev);

#endif
Commit	Line	Data
1da177e4 LT	1	#ifndef _NDISC_H
	2	#define _NDISC_H
	3
	4	/*
	5	* ICMP codes for neighbour discovery messages
	6	*/
	7
	8	#define NDISC_ROUTER_SOLICITATION 133
	9	#define NDISC_ROUTER_ADVERTISEMENT 134
	10	#define NDISC_NEIGHBOUR_SOLICITATION 135
	11	#define NDISC_NEIGHBOUR_ADVERTISEMENT 136
	12	#define NDISC_REDIRECT 137
	13
fadf6bf0 TF	14	/*
	15	* Router type: cross-layer information from link-layer to
	16	* IPv6 layer reported by certain link types (e.g., RFC4214).
	17	*/
	18	#define NDISC_NODETYPE_UNSPEC 0 /* unspecified (default) */
	19	#define NDISC_NODETYPE_HOST 1 /* host or unauthorized router */
	20	#define NDISC_NODETYPE_NODEFAULT 2 /* non-default router */
	21	#define NDISC_NODETYPE_DEFAULT 3 /* default router */
	22
1da177e4 LT	23	/*
	24	* ndisc options
	25	*/
	26
	27	enum {
	28	__ND_OPT_PREFIX_INFO_END = 0,
	29	ND_OPT_SOURCE_LL_ADDR = 1, /* RFC2461 */
	30	ND_OPT_TARGET_LL_ADDR = 2, /* RFC2461 */
	31	ND_OPT_PREFIX_INFO = 3, /* RFC2461 */
	32	ND_OPT_REDIRECT_HDR = 4, /* RFC2461 */
	33	ND_OPT_MTU = 5, /* RFC2461 */
70ceb4f5 YH	34	__ND_OPT_ARRAY_MAX,
70ceb4f5 YH	35	ND_OPT_ROUTE_INFO = 24, /* RFC4191 */
31910575	36	ND_OPT_RDNSS = 25, /* RFC5006 */
e35f30c1	37	ND_OPT_DNSSL = 31, /* RFC6106 */
1da177e4 LT	38	__ND_OPT_MAX
	39	};
	40
	41	#define MAX_RTR_SOLICITATION_DELAY HZ
	42
	43	#define ND_REACHABLE_TIME (30*HZ)
	44	#define ND_RETRANS_TIMER HZ
	45
14c85021	46	#include <linux/compiler.h>
1da177e4	47	#include <linux/icmpv6.h>
14c85021 ACM	48	#include <linux/in6.h>
14c85021 ACM	49	#include <linux/types.h>
30f2a5f3 DM	50	#include <linux/if_arp.h>
30f2a5f3 DM	51	#include <linux/netdevice.h>
b14f243a	52	#include <linux/hash.h>
14c85021	53
1da177e4	54	#include <net/neighbour.h>
14c85021 ACM	55
14c85021 ACM	56	struct ctl_table;
14c85021 ACM	57	struct inet6_dev;
	58	struct net_device;
	59	struct net_proto_family;
	60	struct sk_buff;
1da177e4 LT	61
	62	extern struct neigh_table nd_tbl;
	63
	64	struct nd_msg {
	65	struct icmp6hdr icmph;
	66	struct in6_addr target;
	67	__u8 opt[0];
	68	};
	69
	70	struct rs_msg {
	71	struct icmp6hdr icmph;
	72	__u8 opt[0];
	73	};
	74
	75	struct ra_msg {
	76	struct icmp6hdr icmph;
e69a4adc AV	77	__be32 reachable_time;
e69a4adc AV	78	__be32 retrans_timer;
1da177e4 LT	79	};
1da177e4 LT	80
093d04d4 DJ	81	struct rd_msg {
	82	struct icmp6hdr icmph;
	83	struct in6_addr target;
	84	struct in6_addr dest;
	85	__u8 opt[0];
	86	};
	87
1da177e4 LT	88	struct nd_opt_hdr {
	89	__u8 nd_opt_type;
	90	__u8 nd_opt_len;
bc10502d	91	} __packed;
1da177e4	92
30f2a5f3 DM	93	/* ND options */
	94	struct ndisc_options {
	95	struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX];
	96	#ifdef CONFIG_IPV6_ROUTE_INFO
	97	struct nd_opt_hdr *nd_opts_ri;
	98	struct nd_opt_hdr *nd_opts_ri_end;
	99	#endif
	100	struct nd_opt_hdr *nd_useropts;
	101	struct nd_opt_hdr *nd_useropts_end;
	102	};
	103
	104	#define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR]
	105	#define nd_opts_tgt_lladdr nd_opt_array[ND_OPT_TARGET_LL_ADDR]
	106	#define nd_opts_pi nd_opt_array[ND_OPT_PREFIX_INFO]
	107	#define nd_opts_pi_end nd_opt_array[__ND_OPT_PREFIX_INFO_END]
	108	#define nd_opts_rh nd_opt_array[ND_OPT_REDIRECT_HDR]
	109	#define nd_opts_mtu nd_opt_array[ND_OPT_MTU]
	110
	111	#define NDISC_OPT_SPACE(len) (((len)+2+7)&~7)
	112
3cc818a2 JP	113	struct ndisc_options ndisc_parse_options(u8 opt, int opt_len,
3cc818a2 JP	114	struct ndisc_options *ndopts);
30f2a5f3 DM	115
	116	/*
	117	* Return the padding between the option length and the start of the
	118	* link addr. Currently only IP-over-InfiniBand needs this, although
	119	* if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may
	120	* also need a pad of 2.
	121	*/
d9d10a30	122	static inline int ndisc_addr_option_pad(unsigned short type)
30f2a5f3 DM	123	{
	124	switch (type) {
	125	case ARPHRD_INFINIBAND: return 2;
	126	default: return 0;
	127	}
	128	}
	129
c558e9fc YH	130	static inline int ndisc_opt_addr_space(struct net_device *dev)
	131	{
	132	return NDISC_OPT_SPACE(dev->addr_len +
	133	ndisc_addr_option_pad(dev->type));
	134	}
	135
30f2a5f3 DM	136	static inline u8 ndisc_opt_addr_data(struct nd_opt_hdr p,
	137	struct net_device *dev)
	138	{
	139	u8 lladdr = (u8 )(p + 1);
	140	int lladdrlen = p->nd_opt_len << 3;
	141	int prepad = ndisc_addr_option_pad(dev->type);
c558e9fc	142	if (lladdrlen != ndisc_opt_addr_space(dev))
30f2a5f3 DM	143	return NULL;
	144	return lladdr + prepad;
	145	}
	146
2c2aba6c DM	147	static inline u32 ndisc_hashfn(const void pkey, const struct net_device dev, __u32 *hash_rnd)
	148	{
	149	const u32 *p32 = pkey;
	150
b14f243a	151	return (((p32[0] ^ hash32_ptr(dev)) * hash_rnd[0]) +
2c2aba6c DM	152	(p32[1] * hash_rnd[1]) +
	153	(p32[2] * hash_rnd[2]) +
	154	(p32[3] * hash_rnd[3]));
	155	}
1da177e4	156
ac3175fe	157	static inline struct neighbour __ipv6_neigh_lookup_noref(struct net_device dev, const void *pkey)
f83c7790	158	{
60395a20	159	return ___neigh_lookup_noref(&nd_tbl, neigh_key_eq128, ndisc_hashfn, pkey, dev);
ac3175fe YH	160	}
	161
	162	static inline struct neighbour __ipv6_neigh_lookup(struct net_device dev, const void *pkey)
	163	{
	164	struct neighbour *n;
	165
	166	rcu_read_lock_bh();
	167	n = __ipv6_neigh_lookup_noref(dev, pkey);
	168	if (n && !atomic_inc_not_zero(&n->refcnt))
	169	n = NULL;
f83c7790 DM	170	rcu_read_unlock_bh();
	171
	172	return n;
	173	}
	174
3cc818a2 JP	175	int ndisc_init(void);
3cc818a2 JP	176	int ndisc_late_init(void);
1da177e4	177
3cc818a2 JP	178	void ndisc_late_cleanup(void);
3cc818a2 JP	179	void ndisc_cleanup(void);
1da177e4	180
3cc818a2	181	int ndisc_rcv(struct sk_buff *skb);
1da177e4	182
3cc818a2 JP	183	void ndisc_send_ns(struct net_device dev, struct neighbour neigh,
3cc818a2 JP	184	const struct in6_addr *solicit,
ab450605 JB	185	const struct in6_addr daddr, const struct in6_addr saddr,
ab450605 JB	186	struct sk_buff *oskb);
1da177e4	187
3cc818a2 JP	188	void ndisc_send_rs(struct net_device *dev,
	189	const struct in6_addr saddr, const struct in6_addr daddr);
	190	void ndisc_send_na(struct net_device dev, struct neighbour neigh,
	191	const struct in6_addr *daddr,
	192	const struct in6_addr *solicited_addr,
	193	bool router, bool solicited, bool override, bool inc_opt);
1da177e4	194
3cc818a2	195	void ndisc_send_redirect(struct sk_buff skb, const struct in6_addr target);
1da177e4	196
3cc818a2 JP	197	int ndisc_mc_map(const struct in6_addr addr, char buf, struct net_device *dev,
3cc818a2 JP	198	int dir);
1da177e4	199
1da177e4 LT	200
	201	/*
	202	* IGMP
	203	*/
3cc818a2	204	int igmp6_init(void);
1da177e4	205
3cc818a2	206	void igmp6_cleanup(void);
1da177e4	207
3cc818a2	208	int igmp6_event_query(struct sk_buff *skb);
1da177e4	209
3cc818a2	210	int igmp6_event_report(struct sk_buff *skb);
1da177e4	211
1da177e4 LT	212
1da177e4 LT	213	#ifdef CONFIG_SYSCTL
3cc818a2 JP	214	int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write,
3cc818a2 JP	215	void __user buffer, size_t lenp, loff_t *ppos);
fedaf4ff	216	int ndisc_ifinfo_sysctl_strategy(struct ctl_table *ctl,
f221e726	217	void __user oldval, size_t __user oldlenp,
0686caa3	218	void __user *newval, size_t newlen);
1da177e4 LT	219	#endif
1da177e4 LT	220
3cc818a2	221	void inet6_ifinfo_notify(int event, struct inet6_dev *idev);
1da177e4	222
1da177e4	223	#endif