/* SPDX-License-Identifier: GPL-2.0 *//* *		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> /* IPv4 address key for cache lookups */struct ipv4_addr_key {	__be32	addr;	int	vif;}; #define INETPEER_MAXKEYSZ   (sizeof(struct in6_addr) / sizeof(u32)) struct inetpeer_addr {	union {		struct ipv4_addr_key	a4;		struct in6_addr		a6;		u32			key[INETPEER_MAXKEYSZ];	};	__u16				family;}; struct inet_peer {	struct rb_node		rb_node;	struct inetpeer_addr	daddr; 	u32			metrics[RTAX_MAX];	u32			rate_tokens;	/* rate limiting for ICMP */	u32			n_redirects;	unsigned long		rate_last;	/*	 * Once inet_peer is queued for deletion (refcnt == 0), 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;	}; 	/* following fields might be frequently dirtied */	__u32			dtime;	/* the time of last use of not referenced entries */	refcount_t		refcnt;}; struct inet_peer_base {	struct rb_root		rb_root;	seqlock_t		lock;	int			total;}; void inet_peer_base_init(struct inet_peer_base *); void inet_initpeers(void) __init; #define INETPEER_METRICS_NEW	(~(u32) 0) static inline void inetpeer_set_addr_v4(struct inetpeer_addr *iaddr, __be32 ip){	iaddr->a4.addr = ip;	iaddr->a4.vif = 0;	iaddr->family = AF_INET;} static inline __be32 inetpeer_get_addr_v4(struct inetpeer_addr *iaddr){	return iaddr->a4.addr;} static inline void inetpeer_set_addr_v6(struct inetpeer_addr *iaddr,					struct in6_addr *in6){	iaddr->a6 = *in6;	iaddr->family = AF_INET6;} static inline struct in6_addr *inetpeer_get_addr_v6(struct inetpeer_addr *iaddr){	return &iaddr->a6;} /* 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 vif, int create){	struct inetpeer_addr daddr; 	daddr.a4.addr = v4daddr;	daddr.a4.vif = vif;	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; 	daddr.a6 = *v6daddr;	daddr.family = AF_INET6;	return inet_getpeer(base, &daddr, create);} static inline int inetpeer_addr_cmp(const struct inetpeer_addr *a,				    const struct inetpeer_addr *b){	int i, n; 	if (a->family == AF_INET)		n = sizeof(a->a4) / sizeof(u32);	else		n = sizeof(a->a6) / sizeof(u32); 	for (i = 0; i < n; i++) {		if (a->key[i] == b->key[i])			continue;		if (a->key[i] < b->key[i])			return -1;		return 1;	} 	return 0;} /* 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 *); #endif /* _NET_INETPEER_H */