[mirror_ubuntu-bionic-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 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)

extern 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 int ndisc_addr_option_pad(unsigned short type)
{
	switch (type) {
	case ARPHRD_INFINIBAND: return 2;
	default:                return 0;
	}
}

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_SPACE(dev->addr_len + prepad))
		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(struct neigh_table *tbl, struct net_device *dev, const void *pkey)
{
	struct neigh_hash_table *nht;
	const u32 *p32 = pkey;
	struct neighbour *n;
	u32 hash_val;

	rcu_read_lock_bh();
	nht = rcu_dereference_bh(tbl->nht);
	hash_val = ndisc_hashfn(pkey, dev, nht->hash_rnd) >> (32 - nht->hash_shift);
	for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]);
	     n != NULL;
	     n = rcu_dereference_bh(n->next)) {
		u32 *n32 = (u32 *) n->primary_key;
		if (n->dev == dev &&
		    ((n32[0] ^ p32[0]) | (n32[1] ^ p32[1]) |
		     (n32[2] ^ p32[2]) | (n32[3] ^ p32[3])) == 0) {
			if (!atomic_inc_not_zero(&n->refcnt))
				n = NULL;
			break;
		}
	}
	rcu_read_unlock_bh();

	return n;
}

extern int			ndisc_init(void);

extern void			ndisc_cleanup(void);

extern int			ndisc_rcv(struct sk_buff *skb);

extern 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);

extern void			ndisc_send_rs(struct net_device *dev,
					      const struct in6_addr *saddr,
					      const struct in6_addr *daddr);

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

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

extern struct sk_buff		*ndisc_build_skb(struct net_device *dev,
						 const struct in6_addr *daddr,
						 const struct in6_addr *saddr,
						 struct icmp6hdr *icmp6h,
						 const struct in6_addr *target,
						 int llinfo);

extern void			ndisc_send_skb(struct sk_buff *skb,
					       struct net_device *dev,
					       struct neighbour *neigh,
					       const struct in6_addr *daddr,
					       const struct in6_addr *saddr,
					       struct icmp6hdr *icmp6h);


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

extern void			igmp6_cleanup(void);

extern int			igmp6_event_query(struct sk_buff *skb);

extern int			igmp6_event_report(struct sk_buff *skb);


#ifdef CONFIG_SYSCTL
extern 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(ctl_table *ctl,
				 void __user *oldval, size_t __user *oldlenp,
				 void __user *newval, size_t newlen);
#endif

extern 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	};
	80
	81	struct nd_opt_hdr {
	82	__u8 nd_opt_type;
	83	__u8 nd_opt_len;
bc10502d	84	} __packed;
1da177e4	85
30f2a5f3 DM	86	/* ND options */
	87	struct ndisc_options {
	88	struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX];
	89	#ifdef CONFIG_IPV6_ROUTE_INFO
	90	struct nd_opt_hdr *nd_opts_ri;
	91	struct nd_opt_hdr *nd_opts_ri_end;
	92	#endif
	93	struct nd_opt_hdr *nd_useropts;
	94	struct nd_opt_hdr *nd_useropts_end;
	95	};
	96
	97	#define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR]
	98	#define nd_opts_tgt_lladdr nd_opt_array[ND_OPT_TARGET_LL_ADDR]
	99	#define nd_opts_pi nd_opt_array[ND_OPT_PREFIX_INFO]
	100	#define nd_opts_pi_end nd_opt_array[__ND_OPT_PREFIX_INFO_END]
	101	#define nd_opts_rh nd_opt_array[ND_OPT_REDIRECT_HDR]
	102	#define nd_opts_mtu nd_opt_array[ND_OPT_MTU]
	103
	104	#define NDISC_OPT_SPACE(len) (((len)+2+7)&~7)
	105
	106	extern struct ndisc_options ndisc_parse_options(u8 opt, int opt_len,
	107	struct ndisc_options *ndopts);
	108
	109	/*
	110	* Return the padding between the option length and the start of the
	111	* link addr. Currently only IP-over-InfiniBand needs this, although
	112	* if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may
	113	* also need a pad of 2.
	114	*/
	115	static int ndisc_addr_option_pad(unsigned short type)
	116	{
	117	switch (type) {
	118	case ARPHRD_INFINIBAND: return 2;
	119	default: return 0;
	120	}
	121	}
	122
	123	static inline u8 ndisc_opt_addr_data(struct nd_opt_hdr p,
	124	struct net_device *dev)
	125	{
	126	u8 lladdr = (u8 )(p + 1);
	127	int lladdrlen = p->nd_opt_len << 3;
	128	int prepad = ndisc_addr_option_pad(dev->type);
	129	if (lladdrlen != NDISC_OPT_SPACE(dev->addr_len + prepad))
	130	return NULL;
	131	return lladdr + prepad;
	132	}
	133
2c2aba6c DM	134	static inline u32 ndisc_hashfn(const void pkey, const struct net_device dev, __u32 *hash_rnd)
	135	{
	136	const u32 *p32 = pkey;
	137
b14f243a	138	return (((p32[0] ^ hash32_ptr(dev)) * hash_rnd[0]) +
2c2aba6c DM	139	(p32[1] * hash_rnd[1]) +
	140	(p32[2] * hash_rnd[2]) +
	141	(p32[3] * hash_rnd[3]));
	142	}
1da177e4	143
f83c7790 DM	144	static inline struct neighbour __ipv6_neigh_lookup(struct neigh_table tbl, struct net_device dev, const void pkey)
	145	{
	146	struct neigh_hash_table *nht;
	147	const u32 *p32 = pkey;
	148	struct neighbour *n;
	149	u32 hash_val;
	150
	151	rcu_read_lock_bh();
	152	nht = rcu_dereference_bh(tbl->nht);
	153	hash_val = ndisc_hashfn(pkey, dev, nht->hash_rnd) >> (32 - nht->hash_shift);
	154	for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]);
	155	n != NULL;
	156	n = rcu_dereference_bh(n->next)) {
	157	u32 n32 = (u32 ) n->primary_key;
	158	if (n->dev == dev &&
	159	((n32[0] ^ p32[0]) \| (n32[1] ^ p32[1]) \|
	160	(n32[2] ^ p32[2]) \| (n32[3] ^ p32[3])) == 0) {
	161	if (!atomic_inc_not_zero(&n->refcnt))
	162	n = NULL;
	163	break;
	164	}
	165	}
	166	rcu_read_unlock_bh();
	167
	168	return n;
	169	}
	170
9b0f976f	171	extern int ndisc_init(void);
1da177e4 LT	172
	173	extern void ndisc_cleanup(void);
	174
	175	extern int ndisc_rcv(struct sk_buff *skb);
	176
	177	extern void ndisc_send_ns(struct net_device *dev,
	178	struct neighbour *neigh,
9acd9f3a YH	179	const struct in6_addr *solicit,
	180	const struct in6_addr *daddr,
	181	const struct in6_addr *saddr);
1da177e4 LT	182
1da177e4 LT	183	extern void ndisc_send_rs(struct net_device *dev,
9acd9f3a YH	184	const struct in6_addr *saddr,
9acd9f3a YH	185	const struct in6_addr *daddr);
1da177e4	186
1da177e4	187	extern void ndisc_send_redirect(struct sk_buff *skb,
9acd9f3a	188	const struct in6_addr *target);
1da177e4	189
b71d1d42 ED	190	extern int ndisc_mc_map(const struct in6_addr addr, char buf,
b71d1d42 ED	191	struct net_device *dev, int dir);
1da177e4	192
305d552a BH	193	extern struct sk_buff ndisc_build_skb(struct net_device dev,
	194	const struct in6_addr *daddr,
	195	const struct in6_addr *saddr,
	196	struct icmp6hdr *icmp6h,
	197	const struct in6_addr *target,
	198	int llinfo);
	199
	200	extern void ndisc_send_skb(struct sk_buff *skb,
	201	struct net_device *dev,
	202	struct neighbour *neigh,
	203	const struct in6_addr *daddr,
	204	const struct in6_addr *saddr,
	205	struct icmp6hdr *icmp6h);
	206
1da177e4	207
1da177e4 LT	208
	209	/*
	210	* IGMP
	211	*/
9b0f976f	212	extern int igmp6_init(void);
1da177e4 LT	213
	214	extern void igmp6_cleanup(void);
	215
	216	extern int igmp6_event_query(struct sk_buff *skb);
	217
	218	extern int igmp6_event_report(struct sk_buff *skb);
	219
1da177e4 LT	220
1da177e4 LT	221	#ifdef CONFIG_SYSCTL
14c85021	222	extern int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl,
1da177e4	223	int write,
1da177e4 LT	224	void __user *buffer,
	225	size_t *lenp,
	226	loff_t *ppos);
f221e726 AD	227	int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl,
f221e726 AD	228	void __user oldval, size_t __user oldlenp,
0686caa3	229	void __user *newval, size_t newlen);
1da177e4 LT	230	#endif
	231
	232	extern void inet6_ifinfo_notify(int event,
	233	struct inet6_dev *idev);
	234
1da177e4	235	#endif