#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){	struct neigh_hash_table *nht;	const u32 *p32 = pkey;	struct neighbour *n;	u32 hash_val; 	nht = rcu_dereference_bh(nd_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)			return n;	} 	return NULL;} 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); 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_SYSCTLint 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