[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_NONCE = 14,              /* RFC7527 */
	__ND_OPT_ARRAY_MAX,
	ND_OPT_ROUTE_INFO = 24,		/* RFC4191 */
	ND_OPT_RDNSS = 25,		/* RFC5006 */
	ND_OPT_DNSSL = 31,		/* RFC6106 */
	ND_OPT_6CO = 34,		/* RFC6775 */
	__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>

/* Set to 3 to get tracing... */
#define ND_DEBUG 1

#define ND_PRINTK(val, level, fmt, ...)				\
do {								\
	if (val <= ND_DEBUG)					\
		net_##level##_ratelimited(fmt, ##__VA_ARGS__);	\
} while (0)

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

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;
#if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
	struct nd_opt_hdr *nd_802154_opt_array[ND_OPT_TARGET_LL_ADDR + 1];
#endif
};

#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 nd_opts_nonce			nd_opt_array[ND_OPT_NONCE]
#define nd_802154_opts_src_lladdr	nd_802154_opt_array[ND_OPT_SOURCE_LL_ADDR]
#define nd_802154_opts_tgt_lladdr	nd_802154_opt_array[ND_OPT_TARGET_LL_ADDR]

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

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

void __ndisc_fill_addr_option(struct sk_buff *skb, int type, void *data,
			      int data_len, int pad);

#define NDISC_OPS_REDIRECT_DATA_SPACE	2

/*
 * This structure defines the hooks for IPv6 neighbour discovery.
 * The following hooks can be defined; unless noted otherwise, they are
 * optional and can be filled with a null pointer.
 *
 * int (*is_useropt)(u8 nd_opt_type):
 *     This function is called when IPv6 decide RA userspace options. if
 *     this function returns 1 then the option given by nd_opt_type will
 *     be handled as userspace option additional to the IPv6 options.
 *
 * int (*parse_options)(const struct net_device *dev,
 *			struct nd_opt_hdr *nd_opt,
 *			struct ndisc_options *ndopts):
 *     This function is called while parsing ndisc ops and put each position
 *     as pointer into ndopts. If this function return unequal 0, then this
 *     function took care about the ndisc option, if 0 then the IPv6 ndisc
 *     option parser will take care about that option.
 *
 * void (*update)(const struct net_device *dev, struct neighbour *n,
 *		  u32 flags, u8 icmp6_type,
 *		  const struct ndisc_options *ndopts):
 *     This function is called when IPv6 ndisc updates the neighbour cache
 *     entry. Additional options which can be updated may be previously
 *     parsed by parse_opts callback and accessible over ndopts parameter.
 *
 * int (*opt_addr_space)(const struct net_device *dev, u8 icmp6_type,
 *			 struct neighbour *neigh, u8 *ha_buf,
 *			 u8 **ha):
 *     This function is called when the necessary option space will be
 *     calculated before allocating a skb. The parameters neigh, ha_buf
 *     abd ha are available on NDISC_REDIRECT messages only.
 *
 * void (*fill_addr_option)(const struct net_device *dev,
 *			    struct sk_buff *skb, u8 icmp6_type,
 *			    const u8 *ha):
 *     This function is called when the skb will finally fill the option
 *     fields inside skb. NOTE: this callback should fill the option
 *     fields to the skb which are previously indicated by opt_space
 *     parameter. That means the decision to add such option should
 *     not lost between these two callbacks, e.g. protected by interface
 *     up state.
 *
 * void (*prefix_rcv_add_addr)(struct net *net, struct net_device *dev,
 *			       const struct prefix_info *pinfo,
 *			       struct inet6_dev *in6_dev,
 *			       struct in6_addr *addr,
 *			       int addr_type, u32 addr_flags,
 *			       bool sllao, bool tokenized,
 *			       __u32 valid_lft, u32 prefered_lft,
 *			       bool dev_addr_generated):
 *     This function is called when a RA messages is received with valid
 *     PIO option fields and an IPv6 address will be added to the interface
 *     for autoconfiguration. The parameter dev_addr_generated reports about
 *     if the address was based on dev->dev_addr or not. This can be used
 *     to add a second address if link-layer operates with two link layer
 *     addresses. E.g. 802.15.4 6LoWPAN.
 */
struct ndisc_ops {
	int	(*is_useropt)(u8 nd_opt_type);
	int	(*parse_options)(const struct net_device *dev,
				 struct nd_opt_hdr *nd_opt,
				 struct ndisc_options *ndopts);
	void	(*update)(const struct net_device *dev, struct neighbour *n,
			  u32 flags, u8 icmp6_type,
			  const struct ndisc_options *ndopts);
	int	(*opt_addr_space)(const struct net_device *dev, u8 icmp6_type,
				  struct neighbour *neigh, u8 *ha_buf,
				  u8 **ha);
	void	(*fill_addr_option)(const struct net_device *dev,
				    struct sk_buff *skb, u8 icmp6_type,
				    const u8 *ha);
	void	(*prefix_rcv_add_addr)(struct net *net, struct net_device *dev,
				       const struct prefix_info *pinfo,
				       struct inet6_dev *in6_dev,
				       struct in6_addr *addr,
				       int addr_type, u32 addr_flags,
				       bool sllao, bool tokenized,
				       __u32 valid_lft, u32 prefered_lft,
				       bool dev_addr_generated);
};

#if IS_ENABLED(CONFIG_IPV6)
static inline int ndisc_ops_is_useropt(const struct net_device *dev,
				       u8 nd_opt_type)
{
	if (dev->ndisc_ops && dev->ndisc_ops->is_useropt)
		return dev->ndisc_ops->is_useropt(nd_opt_type);
	else
		return 0;
}

static inline int ndisc_ops_parse_options(const struct net_device *dev,
					  struct nd_opt_hdr *nd_opt,
					  struct ndisc_options *ndopts)
{
	if (dev->ndisc_ops && dev->ndisc_ops->parse_options)
		return dev->ndisc_ops->parse_options(dev, nd_opt, ndopts);
	else
		return 0;
}

static inline void ndisc_ops_update(const struct net_device *dev,
					  struct neighbour *n, u32 flags,
					  u8 icmp6_type,
					  const struct ndisc_options *ndopts)
{
	if (dev->ndisc_ops && dev->ndisc_ops->update)
		dev->ndisc_ops->update(dev, n, flags, icmp6_type, ndopts);
}

static inline int ndisc_ops_opt_addr_space(const struct net_device *dev,
					   u8 icmp6_type)
{
	if (dev->ndisc_ops && dev->ndisc_ops->opt_addr_space &&
	    icmp6_type != NDISC_REDIRECT)
		return dev->ndisc_ops->opt_addr_space(dev, icmp6_type, NULL,
						      NULL, NULL);
	else
		return 0;
}

static inline int ndisc_ops_redirect_opt_addr_space(const struct net_device *dev,
						    struct neighbour *neigh,
						    u8 *ha_buf, u8 **ha)
{
	if (dev->ndisc_ops && dev->ndisc_ops->opt_addr_space)
		return dev->ndisc_ops->opt_addr_space(dev, NDISC_REDIRECT,
						      neigh, ha_buf, ha);
	else
		return 0;
}

static inline void ndisc_ops_fill_addr_option(const struct net_device *dev,
					      struct sk_buff *skb,
					      u8 icmp6_type)
{
	if (dev->ndisc_ops && dev->ndisc_ops->fill_addr_option &&
	    icmp6_type != NDISC_REDIRECT)
		dev->ndisc_ops->fill_addr_option(dev, skb, icmp6_type, NULL);
}

static inline void ndisc_ops_fill_redirect_addr_option(const struct net_device *dev,
						       struct sk_buff *skb,
						       const u8 *ha)
{
	if (dev->ndisc_ops && dev->ndisc_ops->fill_addr_option)
		dev->ndisc_ops->fill_addr_option(dev, skb, NDISC_REDIRECT, ha);
}

static inline void ndisc_ops_prefix_rcv_add_addr(struct net *net,
						 struct net_device *dev,
						 const struct prefix_info *pinfo,
						 struct inet6_dev *in6_dev,
						 struct in6_addr *addr,
						 int addr_type, u32 addr_flags,
						 bool sllao, bool tokenized,
						 __u32 valid_lft,
						 u32 prefered_lft,
						 bool dev_addr_generated)
{
	if (dev->ndisc_ops && dev->ndisc_ops->prefix_rcv_add_addr)
		dev->ndisc_ops->prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
						    addr, addr_type,
						    addr_flags, sllao,
						    tokenized, valid_lft,
						    prefered_lft,
						    dev_addr_generated);
}
#endif

/*
 * 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(unsigned char addr_len, int pad)
{
	return NDISC_OPT_SPACE(addr_len + pad);
}

#if IS_ENABLED(CONFIG_IPV6)
static inline int ndisc_opt_addr_space(struct net_device *dev, u8 icmp6_type)
{
	return __ndisc_opt_addr_space(dev->addr_len,
				      ndisc_addr_option_pad(dev->type)) +
		ndisc_ops_opt_addr_space(dev, icmp6_type);
}

static inline int ndisc_redirect_opt_addr_space(struct net_device *dev,
						struct neighbour *neigh,
						u8 *ops_data_buf,
						u8 **ops_data)
{
	return __ndisc_opt_addr_space(dev->addr_len,
				      ndisc_addr_option_pad(dev->type)) +
		ndisc_ops_redirect_opt_addr_space(dev, neigh, ops_data_buf,
						  ops_data);
}
#endif

static inline u8 *__ndisc_opt_addr_data(struct nd_opt_hdr *p,
					unsigned char addr_len, int prepad)
{
	u8 *lladdr = (u8 *)(p + 1);
	int lladdrlen = p->nd_opt_len << 3;
	if (lladdrlen != __ndisc_opt_addr_space(addr_len, prepad))
		return NULL;
	return lladdr + prepad;
}

static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p,
				      struct net_device *dev)
{
	return __ndisc_opt_addr_data(p, dev->addr_len,
				     ndisc_addr_option_pad(dev->type));
}

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, const struct in6_addr *solicit,
		   const struct in6_addr *daddr, const struct in6_addr *saddr,
		   u64 nonce);

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, 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);

void ndisc_update(const struct net_device *dev, struct neighbour *neigh,
		  const u8 *lladdr, u8 new, u32 flags, u8 icmp6_type,
		  struct ndisc_options *ndopts);

/*
 *	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 */
adc176c5	34	ND_OPT_NONCE = 14, /* RFC7527 */
70ceb4f5 YH	35	__ND_OPT_ARRAY_MAX,
70ceb4f5 YH	36	ND_OPT_ROUTE_INFO = 24, /* RFC4191 */
31910575	37	ND_OPT_RDNSS = 25, /* RFC5006 */
e35f30c1	38	ND_OPT_DNSSL = 31, /* RFC6106 */
bbe5f5ce	39	ND_OPT_6CO = 34, /* RFC6775 */
1da177e4 LT	40	__ND_OPT_MAX
	41	};
	42
	43	#define MAX_RTR_SOLICITATION_DELAY HZ
	44
	45	#define ND_REACHABLE_TIME (30*HZ)
	46	#define ND_RETRANS_TIMER HZ
	47
14c85021	48	#include <linux/compiler.h>
1da177e4	49	#include <linux/icmpv6.h>
14c85021 ACM	50	#include <linux/in6.h>
14c85021 ACM	51	#include <linux/types.h>
30f2a5f3 DM	52	#include <linux/if_arp.h>
30f2a5f3 DM	53	#include <linux/netdevice.h>
b14f243a	54	#include <linux/hash.h>
14c85021	55
1da177e4	56	#include <net/neighbour.h>
14c85021	57
cc84b3c6 AA	58	/* Set to 3 to get tracing... */
	59	#define ND_DEBUG 1
	60
	61	#define ND_PRINTK(val, level, fmt, ...) \
	62	do { \
	63	if (val <= ND_DEBUG) \
	64	net_##level##_ratelimited(fmt, ##__VA_ARGS__); \
	65	} while (0)
	66
14c85021	67	struct ctl_table;
14c85021 ACM	68	struct inet6_dev;
	69	struct net_device;
	70	struct net_proto_family;
	71	struct sk_buff;
f997c55c	72	struct prefix_info;
1da177e4 LT	73
	74	extern struct neigh_table nd_tbl;
	75
	76	struct nd_msg {
	77	struct icmp6hdr icmph;
	78	struct in6_addr target;
	79	__u8 opt[0];
	80	};
	81
	82	struct rs_msg {
	83	struct icmp6hdr icmph;
	84	__u8 opt[0];
	85	};
	86
	87	struct ra_msg {
	88	struct icmp6hdr icmph;
e69a4adc AV	89	__be32 reachable_time;
e69a4adc AV	90	__be32 retrans_timer;
1da177e4 LT	91	};
1da177e4 LT	92
093d04d4 DJ	93	struct rd_msg {
	94	struct icmp6hdr icmph;
	95	struct in6_addr target;
	96	struct in6_addr dest;
	97	__u8 opt[0];
	98	};
	99
1da177e4 LT	100	struct nd_opt_hdr {
	101	__u8 nd_opt_type;
	102	__u8 nd_opt_len;
bc10502d	103	} __packed;
1da177e4	104
30f2a5f3 DM	105	/* ND options */
	106	struct ndisc_options {
	107	struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX];
	108	#ifdef CONFIG_IPV6_ROUTE_INFO
	109	struct nd_opt_hdr *nd_opts_ri;
	110	struct nd_opt_hdr *nd_opts_ri_end;
	111	#endif
	112	struct nd_opt_hdr *nd_useropts;
	113	struct nd_opt_hdr *nd_useropts_end;
bbe5f5ce AA	114	#if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
	115	struct nd_opt_hdr *nd_802154_opt_array[ND_OPT_TARGET_LL_ADDR + 1];
	116	#endif
30f2a5f3 DM	117	};
30f2a5f3 DM	118
bbe5f5ce AA	119	#define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR]
	120	#define nd_opts_tgt_lladdr nd_opt_array[ND_OPT_TARGET_LL_ADDR]
	121	#define nd_opts_pi nd_opt_array[ND_OPT_PREFIX_INFO]
	122	#define nd_opts_pi_end nd_opt_array[__ND_OPT_PREFIX_INFO_END]
	123	#define nd_opts_rh nd_opt_array[ND_OPT_REDIRECT_HDR]
	124	#define nd_opts_mtu nd_opt_array[ND_OPT_MTU]
adc176c5	125	#define nd_opts_nonce nd_opt_array[ND_OPT_NONCE]
bbe5f5ce AA	126	#define nd_802154_opts_src_lladdr nd_802154_opt_array[ND_OPT_SOURCE_LL_ADDR]
bbe5f5ce AA	127	#define nd_802154_opts_tgt_lladdr nd_802154_opt_array[ND_OPT_TARGET_LL_ADDR]
30f2a5f3 DM	128
	129	#define NDISC_OPT_SPACE(len) (((len)+2+7)&~7)
	130
f997c55c AA	131	struct ndisc_options ndisc_parse_options(const struct net_device dev,
f997c55c AA	132	u8 *opt, int opt_len,
3cc818a2	133	struct ndisc_options *ndopts);
30f2a5f3	134
cc84b3c6 AA	135	void __ndisc_fill_addr_option(struct sk_buff skb, int type, void data,
	136	int data_len, int pad);
	137
f997c55c AA	138	#define NDISC_OPS_REDIRECT_DATA_SPACE 2
	139
	140	/*
	141	* This structure defines the hooks for IPv6 neighbour discovery.
	142	* The following hooks can be defined; unless noted otherwise, they are
	143	* optional and can be filled with a null pointer.
	144	*
	145	* int (*is_useropt)(u8 nd_opt_type):
	146	* This function is called when IPv6 decide RA userspace options. if
	147	* this function returns 1 then the option given by nd_opt_type will
	148	* be handled as userspace option additional to the IPv6 options.
	149	*
	150	* int (parse_options)(const struct net_device dev,
	151	* struct nd_opt_hdr *nd_opt,
	152	* struct ndisc_options *ndopts):
	153	* This function is called while parsing ndisc ops and put each position
	154	* as pointer into ndopts. If this function return unequal 0, then this
	155	* function took care about the ndisc option, if 0 then the IPv6 ndisc
	156	* option parser will take care about that option.
	157	*
	158	* void (update)(const struct net_device dev, struct neighbour *n,
	159	* u32 flags, u8 icmp6_type,
	160	* const struct ndisc_options *ndopts):
	161	* This function is called when IPv6 ndisc updates the neighbour cache
	162	* entry. Additional options which can be updated may be previously
	163	* parsed by parse_opts callback and accessible over ndopts parameter.
	164	*
	165	* int (opt_addr_space)(const struct net_device dev, u8 icmp6_type,
	166	* struct neighbour neigh, u8 ha_buf,
	167	* u8 **ha):
	168	* This function is called when the necessary option space will be
	169	* calculated before allocating a skb. The parameters neigh, ha_buf
	170	* abd ha are available on NDISC_REDIRECT messages only.
	171	*
	172	* void (fill_addr_option)(const struct net_device dev,
	173	* struct sk_buff *skb, u8 icmp6_type,
	174	* const u8 *ha):
	175	* This function is called when the skb will finally fill the option
	176	* fields inside skb. NOTE: this callback should fill the option
	177	* fields to the skb which are previously indicated by opt_space
	178	* parameter. That means the decision to add such option should
	179	* not lost between these two callbacks, e.g. protected by interface
	180	* up state.
	181	*
	182	* void (prefix_rcv_add_addr)(struct net net, struct net_device *dev,
	183	* const struct prefix_info *pinfo,
	184	* struct inet6_dev *in6_dev,
	185	* struct in6_addr *addr,
	186	* int addr_type, u32 addr_flags,
	187	* bool sllao, bool tokenized,
	188	* __u32 valid_lft, u32 prefered_lft,
	189	* bool dev_addr_generated):
	190	* This function is called when a RA messages is received with valid
	191	* PIO option fields and an IPv6 address will be added to the interface
	192	* for autoconfiguration. The parameter dev_addr_generated reports about
	193	* if the address was based on dev->dev_addr or not. This can be used
	194	* to add a second address if link-layer operates with two link layer
	195	* addresses. E.g. 802.15.4 6LoWPAN.
	196	*/
	197	struct ndisc_ops {
	198	int (*is_useropt)(u8 nd_opt_type);
	199	int (parse_options)(const struct net_device dev,
	200	struct nd_opt_hdr *nd_opt,
	201	struct ndisc_options *ndopts);
202	void (update)(const struct net_device dev, struct neighbour *n,
203	u32 flags, u8 icmp6_type,
204	const struct ndisc_options *ndopts);
205	int (opt_addr_space)(const struct net_device dev, u8 icmp6_type,
206	struct neighbour neigh, u8 ha_buf,
207	u8 **ha);
208	void (fill_addr_option)(const struct net_device dev,
209	struct sk_buff *skb, u8 icmp6_type,
210	const u8 *ha);
211	void (prefix_rcv_add_addr)(struct net net, struct net_device *dev,
212	const struct prefix_info *pinfo,
213	struct inet6_dev *in6_dev,
214	struct in6_addr *addr,
215	int addr_type, u32 addr_flags,
216	bool sllao, bool tokenized,
217	__u32 valid_lft, u32 prefered_lft,
218	bool dev_addr_generated);
219	};
220
221	#if IS_ENABLED(CONFIG_IPV6)
222	static inline int ndisc_ops_is_useropt(const struct net_device *dev,
223	u8 nd_opt_type)
224	{
225	if (dev->ndisc_ops && dev->ndisc_ops->is_useropt)
226	return dev->ndisc_ops->is_useropt(nd_opt_type);
227	else
228	return 0;
229	}
230
231	static inline int ndisc_ops_parse_options(const struct net_device *dev,
232	struct nd_opt_hdr *nd_opt,
233	struct ndisc_options *ndopts)
234	{
235	if (dev->ndisc_ops && dev->ndisc_ops->parse_options)
236	return dev->ndisc_ops->parse_options(dev, nd_opt, ndopts);
237	else
238	return 0;
239	}
240
241	static inline void ndisc_ops_update(const struct net_device *dev,
242	struct neighbour *n, u32 flags,
243	u8 icmp6_type,
244	const struct ndisc_options *ndopts)
245	{
246	if (dev->ndisc_ops && dev->ndisc_ops->update)
247	dev->ndisc_ops->update(dev, n, flags, icmp6_type, ndopts);
248	}
249
250	static inline int ndisc_ops_opt_addr_space(const struct net_device *dev,
251	u8 icmp6_type)
252	{
253	if (dev->ndisc_ops && dev->ndisc_ops->opt_addr_space &&
254	icmp6_type != NDISC_REDIRECT)
255	return dev->ndisc_ops->opt_addr_space(dev, icmp6_type, NULL,
256	NULL, NULL);
257	else
258	return 0;
259	}
260
261	static inline int ndisc_ops_redirect_opt_addr_space(const struct net_device *dev,
262	struct neighbour *neigh,
263	u8 ha_buf, u8 *ha)
264	{
265	if (dev->ndisc_ops && dev->ndisc_ops->opt_addr_space)
266	return dev->ndisc_ops->opt_addr_space(dev, NDISC_REDIRECT,
267	neigh, ha_buf, ha);
268	else
269	return 0;
270	}
271
272	static inline void ndisc_ops_fill_addr_option(const struct net_device *dev,
273	struct sk_buff *skb,
274	u8 icmp6_type)
275	{
276	if (dev->ndisc_ops && dev->ndisc_ops->fill_addr_option &&
277	icmp6_type != NDISC_REDIRECT)
278	dev->ndisc_ops->fill_addr_option(dev, skb, icmp6_type, NULL);
279	}
280
281	static inline void ndisc_ops_fill_redirect_addr_option(const struct net_device *dev,
282	struct sk_buff *skb,
283	const u8 *ha)
284	{
285	if (dev->ndisc_ops && dev->ndisc_ops->fill_addr_option)
286	dev->ndisc_ops->fill_addr_option(dev, skb, NDISC_REDIRECT, ha);
287	}
288
289	static inline void ndisc_ops_prefix_rcv_add_addr(struct net *net,
290	struct net_device *dev,
291	const struct prefix_info *pinfo,
292	struct inet6_dev *in6_dev,
293	struct in6_addr *addr,
294	int addr_type, u32 addr_flags,
295	bool sllao, bool tokenized,
296	__u32 valid_lft,
297	u32 prefered_lft,
298	bool dev_addr_generated)
299	{
300	if (dev->ndisc_ops && dev->ndisc_ops->prefix_rcv_add_addr)
301	dev->ndisc_ops->prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
302	addr, addr_type,
303	addr_flags, sllao,
304	tokenized, valid_lft,
305	prefered_lft,
306	dev_addr_generated);
307	}
308	#endif
309
30f2a5f3 DM	310	/*
	311	* Return the padding between the option length and the start of the
	312	* link addr. Currently only IP-over-InfiniBand needs this, although
	313	* if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may
	314	* also need a pad of 2.
	315	*/
d9d10a30	316	static inline int ndisc_addr_option_pad(unsigned short type)
30f2a5f3 DM	317	{
	318	switch (type) {
	319	case ARPHRD_INFINIBAND: return 2;
	320	default: return 0;
	321	}
	322	}
	323
1e82f961 AA	324	static inline int __ndisc_opt_addr_space(unsigned char addr_len, int pad)
	325	{
	326	return NDISC_OPT_SPACE(addr_len + pad);
	327	}
	328
f997c55c AA	329	#if IS_ENABLED(CONFIG_IPV6)
	330	static inline int ndisc_opt_addr_space(struct net_device *dev, u8 icmp6_type)
	331	{
	332	return __ndisc_opt_addr_space(dev->addr_len,
	333	ndisc_addr_option_pad(dev->type)) +
	334	ndisc_ops_opt_addr_space(dev, icmp6_type);
	335	}
	336
	337	static inline int ndisc_redirect_opt_addr_space(struct net_device *dev,
	338	struct neighbour *neigh,
	339	u8 *ops_data_buf,
	340	u8 **ops_data)
c558e9fc	341	{
1e82f961	342	return __ndisc_opt_addr_space(dev->addr_len,
f997c55c AA	343	ndisc_addr_option_pad(dev->type)) +
	344	ndisc_ops_redirect_opt_addr_space(dev, neigh, ops_data_buf,
	345	ops_data);
c558e9fc	346	}
f997c55c	347	#endif
c558e9fc	348
4f36ce84 AA	349	static inline u8 __ndisc_opt_addr_data(struct nd_opt_hdr p,
4f36ce84 AA	350	unsigned char addr_len, int prepad)
30f2a5f3 DM	351	{
	352	u8 lladdr = (u8 )(p + 1);
	353	int lladdrlen = p->nd_opt_len << 3;
4f36ce84	354	if (lladdrlen != __ndisc_opt_addr_space(addr_len, prepad))
30f2a5f3 DM	355	return NULL;
	356	return lladdr + prepad;
	357	}
	358
4f36ce84 AA	359	static inline u8 ndisc_opt_addr_data(struct nd_opt_hdr p,
	360	struct net_device *dev)
	361	{
	362	return __ndisc_opt_addr_data(p, dev->addr_len,
	363	ndisc_addr_option_pad(dev->type));
	364	}
	365
2c2aba6c DM	366	static inline u32 ndisc_hashfn(const void pkey, const struct net_device dev, __u32 *hash_rnd)
	367	{
	368	const u32 *p32 = pkey;
	369
b14f243a	370	return (((p32[0] ^ hash32_ptr(dev)) * hash_rnd[0]) +
2c2aba6c DM	371	(p32[1] * hash_rnd[1]) +
	372	(p32[2] * hash_rnd[2]) +
	373	(p32[3] * hash_rnd[3]));
	374	}
1da177e4	375
ac3175fe	376	static inline struct neighbour __ipv6_neigh_lookup_noref(struct net_device dev, const void *pkey)
f83c7790	377	{
60395a20	378	return ___neigh_lookup_noref(&nd_tbl, neigh_key_eq128, ndisc_hashfn, pkey, dev);
ac3175fe YH	379	}
	380
	381	static inline struct neighbour __ipv6_neigh_lookup(struct net_device dev, const void *pkey)
	382	{
	383	struct neighbour *n;
	384
	385	rcu_read_lock_bh();
	386	n = __ipv6_neigh_lookup_noref(dev, pkey);
	387	if (n && !atomic_inc_not_zero(&n->refcnt))
	388	n = NULL;
f83c7790 DM	389	rcu_read_unlock_bh();
	390
	391	return n;
	392	}
	393
3cc818a2 JP	394	int ndisc_init(void);
3cc818a2 JP	395	int ndisc_late_init(void);
1da177e4	396
3cc818a2 JP	397	void ndisc_late_cleanup(void);
3cc818a2 JP	398	void ndisc_cleanup(void);
1da177e4	399
3cc818a2	400	int ndisc_rcv(struct sk_buff *skb);
1da177e4	401
38cf595b	402	void ndisc_send_ns(struct net_device dev, const struct in6_addr solicit,
adc176c5 EN	403	const struct in6_addr daddr, const struct in6_addr saddr,
adc176c5 EN	404	u64 nonce);
1da177e4	405
3cc818a2 JP	406	void ndisc_send_rs(struct net_device *dev,
3cc818a2 JP	407	const struct in6_addr saddr, const struct in6_addr daddr);
38cf595b	408	void ndisc_send_na(struct net_device dev, const struct in6_addr daddr,
3cc818a2 JP	409	const struct in6_addr *solicited_addr,
3cc818a2 JP	410	bool router, bool solicited, bool override, bool inc_opt);
1da177e4	411
3cc818a2	412	void ndisc_send_redirect(struct sk_buff skb, const struct in6_addr target);
1da177e4	413
3cc818a2 JP	414	int ndisc_mc_map(const struct in6_addr addr, char buf, struct net_device *dev,
3cc818a2 JP	415	int dir);
1da177e4	416
f997c55c AA	417	void ndisc_update(const struct net_device dev, struct neighbour neigh,
	418	const u8 *lladdr, u8 new, u32 flags, u8 icmp6_type,
	419	struct ndisc_options *ndopts);
1da177e4 LT	420
	421	/*
	422	* IGMP
	423	*/
3cc818a2	424	int igmp6_init(void);
1da177e4	425
3cc818a2	426	void igmp6_cleanup(void);
1da177e4	427
3cc818a2	428	int igmp6_event_query(struct sk_buff *skb);
1da177e4	429
3cc818a2	430	int igmp6_event_report(struct sk_buff *skb);
1da177e4	431
1da177e4 LT	432
1da177e4 LT	433	#ifdef CONFIG_SYSCTL
3cc818a2 JP	434	int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write,
3cc818a2 JP	435	void __user buffer, size_t lenp, loff_t *ppos);
fedaf4ff	436	int ndisc_ifinfo_sysctl_strategy(struct ctl_table *ctl,
f221e726	437	void __user oldval, size_t __user oldlenp,
0686caa3	438	void __user *newval, size_t newlen);
1da177e4 LT	439	#endif
1da177e4 LT	440
3cc818a2	441	void inet6_ifinfo_notify(int event, struct inet6_dev *idev);
1da177e4	442
1da177e4	443	#endif