/* *		INETPEER - A storage for permanent information about peers * *  Authors:	Andrey V. Savochkin <saw@msu.ru> */ #ifndef _NET_INETPEER_H#define _NET_INETPEER_H #include <linux/types.h>#include <linux/init.h>#include <linux/jiffies.h>#include <linux/spinlock.h>#include <linux/rtnetlink.h>#include <net/ipv6.h>#include <linux/atomic.h> struct inetpeer_addr_base {	union {		__be32			a4;		__be32			a6[4];	};}; struct inetpeer_addr {	struct inetpeer_addr_base	addr;	__u16				family;}; struct inet_peer {	/* group together avl_left,avl_right,v4daddr to speedup lookups */	struct inet_peer __rcu	*avl_left, *avl_right;	struct inetpeer_addr	daddr;	__u32			avl_height; 	u32			metrics[RTAX_MAX];	u32			rate_tokens;	/* rate limiting for ICMP */	unsigned long		rate_last;	union {		struct list_head	gc_list;		struct rcu_head     gc_rcu;	};	/*	 * Once inet_peer is queued for deletion (refcnt == -1), following field	 * is not available: rid	 * We can share memory with rcu_head to help keep inet_peer small.	 */	union {		struct {			atomic_t			rid;		/* Frag reception counter */		};		struct rcu_head         rcu;		struct inet_peer	*gc_next;	}; 	/* following fields might be frequently dirtied */	__u32			dtime;	/* the time of last use of not referenced entries */	atomic_t		refcnt;}; struct inet_peer_base {	struct inet_peer __rcu	*root;	seqlock_t		lock;	int			total;}; #define INETPEER_BASE_BIT	0x1UL static inline struct inet_peer *inetpeer_ptr(unsigned long val){	BUG_ON(val & INETPEER_BASE_BIT);	return (struct inet_peer *) val;} static inline struct inet_peer_base *inetpeer_base_ptr(unsigned long val){	if (!(val & INETPEER_BASE_BIT))		return NULL;	val &= ~INETPEER_BASE_BIT;	return (struct inet_peer_base *) val;} static inline bool inetpeer_ptr_is_peer(unsigned long val){	return !(val & INETPEER_BASE_BIT);} static inline void __inetpeer_ptr_set_peer(unsigned long *val, struct inet_peer *peer){	/* This implicitly clears INETPEER_BASE_BIT */	*val = (unsigned long) peer;} static inline bool inetpeer_ptr_set_peer(unsigned long *ptr, struct inet_peer *peer){	unsigned long val = (unsigned long) peer;	unsigned long orig = *ptr; 	if (!(orig & INETPEER_BASE_BIT) ||	    cmpxchg(ptr, orig, val) != orig)		return false;	return true;} static inline void inetpeer_init_ptr(unsigned long *ptr, struct inet_peer_base *base){	*ptr = (unsigned long) base | INETPEER_BASE_BIT;} static inline void inetpeer_transfer_peer(unsigned long *to, unsigned long *from){	unsigned long val = *from; 	*to = val;	if (inetpeer_ptr_is_peer(val)) {		struct inet_peer *peer = inetpeer_ptr(val);		atomic_inc(&peer->refcnt);	}} void inet_peer_base_init(struct inet_peer_base *); void inet_initpeers(void) __init; #define INETPEER_METRICS_NEW	(~(u32) 0) static inline bool inet_metrics_new(const struct inet_peer *p){	return p->metrics[RTAX_LOCK-1] == INETPEER_METRICS_NEW;} /* can be called with or without local BH being disabled */struct inet_peer *inet_getpeer(struct inet_peer_base *base,			       const struct inetpeer_addr *daddr,			       int create); static inline struct inet_peer *inet_getpeer_v4(struct inet_peer_base *base,						__be32 v4daddr,						int create){	struct inetpeer_addr daddr; 	daddr.addr.a4 = v4daddr;	daddr.family = AF_INET;	return inet_getpeer(base, &daddr, create);} static inline struct inet_peer *inet_getpeer_v6(struct inet_peer_base *base,						const struct in6_addr *v6daddr,						int create){	struct inetpeer_addr daddr; 	*(struct in6_addr *)daddr.addr.a6 = *v6daddr;	daddr.family = AF_INET6;	return inet_getpeer(base, &daddr, create);} /* can be called from BH context or outside */void inet_putpeer(struct inet_peer *p);bool inet_peer_xrlim_allow(struct inet_peer *peer, int timeout); void inetpeer_invalidate_tree(struct inet_peer_base *); /* * temporary check to make sure we dont access rid, tcp_ts, * tcp_ts_stamp if no refcount is taken on inet_peer */static inline void inet_peer_refcheck(const struct inet_peer *p){	WARN_ON_ONCE(atomic_read(&p->refcnt) <= 0);}#endif /* _NET_INETPEER_H */