[deliverable/linux.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;
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;
};

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

#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);

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 */
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;
f997c55c	61	struct prefix_info;
1da177e4 LT	62
	63	extern struct neigh_table nd_tbl;
	64
	65	struct nd_msg {
	66	struct icmp6hdr icmph;
	67	struct in6_addr target;
	68	__u8 opt[0];
	69	};
	70
	71	struct rs_msg {
	72	struct icmp6hdr icmph;
	73	__u8 opt[0];
	74	};
	75
	76	struct ra_msg {
	77	struct icmp6hdr icmph;
e69a4adc AV	78	__be32 reachable_time;
e69a4adc AV	79	__be32 retrans_timer;
1da177e4 LT	80	};
1da177e4 LT	81
093d04d4 DJ	82	struct rd_msg {
	83	struct icmp6hdr icmph;
	84	struct in6_addr target;
	85	struct in6_addr dest;
	86	__u8 opt[0];
	87	};
	88
1da177e4 LT	89	struct nd_opt_hdr {
	90	__u8 nd_opt_type;
	91	__u8 nd_opt_len;
bc10502d	92	} __packed;
1da177e4	93
30f2a5f3 DM	94	/* ND options */
	95	struct ndisc_options {
	96	struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX];
	97	#ifdef CONFIG_IPV6_ROUTE_INFO
	98	struct nd_opt_hdr *nd_opts_ri;
	99	struct nd_opt_hdr *nd_opts_ri_end;
	100	#endif
	101	struct nd_opt_hdr *nd_useropts;
	102	struct nd_opt_hdr *nd_useropts_end;
	103	};
	104
	105	#define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR]
	106	#define nd_opts_tgt_lladdr nd_opt_array[ND_OPT_TARGET_LL_ADDR]
	107	#define nd_opts_pi nd_opt_array[ND_OPT_PREFIX_INFO]
	108	#define nd_opts_pi_end nd_opt_array[__ND_OPT_PREFIX_INFO_END]
	109	#define nd_opts_rh nd_opt_array[ND_OPT_REDIRECT_HDR]
	110	#define nd_opts_mtu nd_opt_array[ND_OPT_MTU]
	111
	112	#define NDISC_OPT_SPACE(len) (((len)+2+7)&~7)
	113
f997c55c AA	114	struct ndisc_options ndisc_parse_options(const struct net_device dev,
f997c55c AA	115	u8 *opt, int opt_len,
3cc818a2	116	struct ndisc_options *ndopts);
30f2a5f3	117
f997c55c AA	118	#define NDISC_OPS_REDIRECT_DATA_SPACE 2
	119
	120	/*
	121	* This structure defines the hooks for IPv6 neighbour discovery.
	122	* The following hooks can be defined; unless noted otherwise, they are
	123	* optional and can be filled with a null pointer.
	124	*
	125	* int (*is_useropt)(u8 nd_opt_type):
	126	* This function is called when IPv6 decide RA userspace options. if
	127	* this function returns 1 then the option given by nd_opt_type will
	128	* be handled as userspace option additional to the IPv6 options.
	129	*
	130	* int (parse_options)(const struct net_device dev,
	131	* struct nd_opt_hdr *nd_opt,
	132	* struct ndisc_options *ndopts):
	133	* This function is called while parsing ndisc ops and put each position
	134	* as pointer into ndopts. If this function return unequal 0, then this
	135	* function took care about the ndisc option, if 0 then the IPv6 ndisc
	136	* option parser will take care about that option.
	137	*
	138	* void (update)(const struct net_device dev, struct neighbour *n,
	139	* u32 flags, u8 icmp6_type,
	140	* const struct ndisc_options *ndopts):
	141	* This function is called when IPv6 ndisc updates the neighbour cache
	142	* entry. Additional options which can be updated may be previously
	143	* parsed by parse_opts callback and accessible over ndopts parameter.
	144	*
	145	* int (opt_addr_space)(const struct net_device dev, u8 icmp6_type,
	146	* struct neighbour neigh, u8 ha_buf,
	147	* u8 **ha):
	148	* This function is called when the necessary option space will be
	149	* calculated before allocating a skb. The parameters neigh, ha_buf
	150	* abd ha are available on NDISC_REDIRECT messages only.
	151	*
	152	* void (fill_addr_option)(const struct net_device dev,
	153	* struct sk_buff *skb, u8 icmp6_type,
	154	* const u8 *ha):
	155	* This function is called when the skb will finally fill the option
	156	* fields inside skb. NOTE: this callback should fill the option
	157	* fields to the skb which are previously indicated by opt_space
	158	* parameter. That means the decision to add such option should
	159	* not lost between these two callbacks, e.g. protected by interface
	160	* up state.
	161	*
	162	* void (prefix_rcv_add_addr)(struct net net, struct net_device *dev,
	163	* const struct prefix_info *pinfo,
	164	* struct inet6_dev *in6_dev,
	165	* struct in6_addr *addr,
	166	* int addr_type, u32 addr_flags,
	167	* bool sllao, bool tokenized,
	168	* __u32 valid_lft, u32 prefered_lft,
	169	* bool dev_addr_generated):
	170	* This function is called when a RA messages is received with valid
	171	* PIO option fields and an IPv6 address will be added to the interface
	172	* for autoconfiguration. The parameter dev_addr_generated reports about
	173	* if the address was based on dev->dev_addr or not. This can be used
	174	* to add a second address if link-layer operates with two link layer
	175	* addresses. E.g. 802.15.4 6LoWPAN.
	176	*/
	177	struct ndisc_ops {
	178	int (*is_useropt)(u8 nd_opt_type);
	179	int (parse_options)(const struct net_device dev,
	180	struct nd_opt_hdr *nd_opt,
	181	struct ndisc_options *ndopts);
182	void (update)(const struct net_device dev, struct neighbour *n,
183	u32 flags, u8 icmp6_type,
184	const struct ndisc_options *ndopts);
185	int (opt_addr_space)(const struct net_device dev, u8 icmp6_type,
186	struct neighbour neigh, u8 ha_buf,
187	u8 **ha);
188	void (fill_addr_option)(const struct net_device dev,
189	struct sk_buff *skb, u8 icmp6_type,
190	const u8 *ha);
191	void (prefix_rcv_add_addr)(struct net net, struct net_device *dev,
192	const struct prefix_info *pinfo,
193	struct inet6_dev *in6_dev,
194	struct in6_addr *addr,
195	int addr_type, u32 addr_flags,
196	bool sllao, bool tokenized,
197	__u32 valid_lft, u32 prefered_lft,
198	bool dev_addr_generated);
199	};
200
201	#if IS_ENABLED(CONFIG_IPV6)
202	static inline int ndisc_ops_is_useropt(const struct net_device *dev,
203	u8 nd_opt_type)
204	{
205	if (dev->ndisc_ops && dev->ndisc_ops->is_useropt)
206	return dev->ndisc_ops->is_useropt(nd_opt_type);
207	else
208	return 0;
209	}
210
211	static inline int ndisc_ops_parse_options(const struct net_device *dev,
212	struct nd_opt_hdr *nd_opt,
213	struct ndisc_options *ndopts)
214	{
215	if (dev->ndisc_ops && dev->ndisc_ops->parse_options)
216	return dev->ndisc_ops->parse_options(dev, nd_opt, ndopts);
217	else
218	return 0;
219	}
220
221	static inline void ndisc_ops_update(const struct net_device *dev,
222	struct neighbour *n, u32 flags,
223	u8 icmp6_type,
224	const struct ndisc_options *ndopts)
225	{
226	if (dev->ndisc_ops && dev->ndisc_ops->update)
227	dev->ndisc_ops->update(dev, n, flags, icmp6_type, ndopts);
228	}
229
230	static inline int ndisc_ops_opt_addr_space(const struct net_device *dev,
231	u8 icmp6_type)
232	{
233	if (dev->ndisc_ops && dev->ndisc_ops->opt_addr_space &&
234	icmp6_type != NDISC_REDIRECT)
235	return dev->ndisc_ops->opt_addr_space(dev, icmp6_type, NULL,
236	NULL, NULL);
237	else
238	return 0;
239	}
240
241	static inline int ndisc_ops_redirect_opt_addr_space(const struct net_device *dev,
242	struct neighbour *neigh,
243	u8 ha_buf, u8 *ha)
244	{
245	if (dev->ndisc_ops && dev->ndisc_ops->opt_addr_space)
246	return dev->ndisc_ops->opt_addr_space(dev, NDISC_REDIRECT,
247	neigh, ha_buf, ha);
248	else
249	return 0;
250	}
251
252	static inline void ndisc_ops_fill_addr_option(const struct net_device *dev,
253	struct sk_buff *skb,
254	u8 icmp6_type)
255	{
256	if (dev->ndisc_ops && dev->ndisc_ops->fill_addr_option &&
257	icmp6_type != NDISC_REDIRECT)
258	dev->ndisc_ops->fill_addr_option(dev, skb, icmp6_type, NULL);
259	}
260
261	static inline void ndisc_ops_fill_redirect_addr_option(const struct net_device *dev,
262	struct sk_buff *skb,
263	const u8 *ha)
264	{
265	if (dev->ndisc_ops && dev->ndisc_ops->fill_addr_option)
266	dev->ndisc_ops->fill_addr_option(dev, skb, NDISC_REDIRECT, ha);
267	}
268
269	static inline void ndisc_ops_prefix_rcv_add_addr(struct net *net,
270	struct net_device *dev,
271	const struct prefix_info *pinfo,
272	struct inet6_dev *in6_dev,
273	struct in6_addr *addr,
274	int addr_type, u32 addr_flags,
275	bool sllao, bool tokenized,
276	__u32 valid_lft,
277	u32 prefered_lft,
278	bool dev_addr_generated)
279	{
280	if (dev->ndisc_ops && dev->ndisc_ops->prefix_rcv_add_addr)
281	dev->ndisc_ops->prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
282	addr, addr_type,
283	addr_flags, sllao,
284	tokenized, valid_lft,
285	prefered_lft,
286	dev_addr_generated);
287	}
288	#endif
289
30f2a5f3 DM	290	/*
	291	* Return the padding between the option length and the start of the
	292	* link addr. Currently only IP-over-InfiniBand needs this, although
	293	* if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may
	294	* also need a pad of 2.
	295	*/
d9d10a30	296	static inline int ndisc_addr_option_pad(unsigned short type)
30f2a5f3 DM	297	{
	298	switch (type) {
	299	case ARPHRD_INFINIBAND: return 2;
	300	default: return 0;
	301	}
	302	}
	303
1e82f961 AA	304	static inline int __ndisc_opt_addr_space(unsigned char addr_len, int pad)
	305	{
	306	return NDISC_OPT_SPACE(addr_len + pad);
	307	}
	308
f997c55c AA	309	#if IS_ENABLED(CONFIG_IPV6)
	310	static inline int ndisc_opt_addr_space(struct net_device *dev, u8 icmp6_type)
	311	{
	312	return __ndisc_opt_addr_space(dev->addr_len,
	313	ndisc_addr_option_pad(dev->type)) +
	314	ndisc_ops_opt_addr_space(dev, icmp6_type);
	315	}
	316
	317	static inline int ndisc_redirect_opt_addr_space(struct net_device *dev,
	318	struct neighbour *neigh,
	319	u8 *ops_data_buf,
	320	u8 **ops_data)
c558e9fc	321	{
1e82f961	322	return __ndisc_opt_addr_space(dev->addr_len,
f997c55c AA	323	ndisc_addr_option_pad(dev->type)) +
	324	ndisc_ops_redirect_opt_addr_space(dev, neigh, ops_data_buf,
	325	ops_data);
c558e9fc	326	}
f997c55c	327	#endif
c558e9fc	328
4f36ce84 AA	329	static inline u8 __ndisc_opt_addr_data(struct nd_opt_hdr p,
4f36ce84 AA	330	unsigned char addr_len, int prepad)
30f2a5f3 DM	331	{
	332	u8 lladdr = (u8 )(p + 1);
	333	int lladdrlen = p->nd_opt_len << 3;
4f36ce84	334	if (lladdrlen != __ndisc_opt_addr_space(addr_len, prepad))
30f2a5f3 DM	335	return NULL;
	336	return lladdr + prepad;
	337	}
	338
4f36ce84 AA	339	static inline u8 ndisc_opt_addr_data(struct nd_opt_hdr p,
	340	struct net_device *dev)
	341	{
	342	return __ndisc_opt_addr_data(p, dev->addr_len,
	343	ndisc_addr_option_pad(dev->type));
	344	}
	345
2c2aba6c DM	346	static inline u32 ndisc_hashfn(const void pkey, const struct net_device dev, __u32 *hash_rnd)
	347	{
	348	const u32 *p32 = pkey;
	349
b14f243a	350	return (((p32[0] ^ hash32_ptr(dev)) * hash_rnd[0]) +
2c2aba6c DM	351	(p32[1] * hash_rnd[1]) +
	352	(p32[2] * hash_rnd[2]) +
	353	(p32[3] * hash_rnd[3]));
	354	}
1da177e4	355
ac3175fe	356	static inline struct neighbour __ipv6_neigh_lookup_noref(struct net_device dev, const void *pkey)
f83c7790	357	{
60395a20	358	return ___neigh_lookup_noref(&nd_tbl, neigh_key_eq128, ndisc_hashfn, pkey, dev);
ac3175fe YH	359	}
	360
	361	static inline struct neighbour __ipv6_neigh_lookup(struct net_device dev, const void *pkey)
	362	{
	363	struct neighbour *n;
	364
	365	rcu_read_lock_bh();
	366	n = __ipv6_neigh_lookup_noref(dev, pkey);
	367	if (n && !atomic_inc_not_zero(&n->refcnt))
	368	n = NULL;
f83c7790 DM	369	rcu_read_unlock_bh();
	370
	371	return n;
	372	}
	373
3cc818a2 JP	374	int ndisc_init(void);
3cc818a2 JP	375	int ndisc_late_init(void);
1da177e4	376
3cc818a2 JP	377	void ndisc_late_cleanup(void);
3cc818a2 JP	378	void ndisc_cleanup(void);
1da177e4	379
3cc818a2	380	int ndisc_rcv(struct sk_buff *skb);
1da177e4	381
38cf595b	382	void ndisc_send_ns(struct net_device dev, const struct in6_addr solicit,
304d888b	383	const struct in6_addr daddr, const struct in6_addr saddr);
1da177e4	384
3cc818a2 JP	385	void ndisc_send_rs(struct net_device *dev,
3cc818a2 JP	386	const struct in6_addr saddr, const struct in6_addr daddr);
38cf595b	387	void ndisc_send_na(struct net_device dev, const struct in6_addr daddr,
3cc818a2 JP	388	const struct in6_addr *solicited_addr,
3cc818a2 JP	389	bool router, bool solicited, bool override, bool inc_opt);
1da177e4	390
3cc818a2	391	void ndisc_send_redirect(struct sk_buff skb, const struct in6_addr target);
1da177e4	392
3cc818a2 JP	393	int ndisc_mc_map(const struct in6_addr addr, char buf, struct net_device *dev,
3cc818a2 JP	394	int dir);
1da177e4	395
f997c55c AA	396	void ndisc_update(const struct net_device dev, struct neighbour neigh,
	397	const u8 *lladdr, u8 new, u32 flags, u8 icmp6_type,
	398	struct ndisc_options *ndopts);
1da177e4 LT	399
	400	/*
	401	* IGMP
	402	*/
3cc818a2	403	int igmp6_init(void);
1da177e4	404
3cc818a2	405	void igmp6_cleanup(void);
1da177e4	406
3cc818a2	407	int igmp6_event_query(struct sk_buff *skb);
1da177e4	408
3cc818a2	409	int igmp6_event_report(struct sk_buff *skb);
1da177e4	410
1da177e4 LT	411
1da177e4 LT	412	#ifdef CONFIG_SYSCTL
3cc818a2 JP	413	int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write,
3cc818a2 JP	414	void __user buffer, size_t lenp, loff_t *ppos);
fedaf4ff	415	int ndisc_ifinfo_sysctl_strategy(struct ctl_table *ctl,
f221e726	416	void __user oldval, size_t __user oldlenp,
0686caa3	417	void __user *newval, size_t newlen);
1da177e4 LT	418	#endif
1da177e4 LT	419
3cc818a2	420	void inet6_ifinfo_notify(int event, struct inet6_dev *idev);
1da177e4	421
1da177e4	422	#endif