/*
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* INETPEER - A storage for permanent information about peers
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*
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* Authors: Andrey V. Savochkin <saw@msu.ru>
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*/
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#ifndef _NET_INETPEER_H
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#define _NET_INETPEER_H
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/jiffies.h>
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#include <linux/spinlock.h>
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#include <linux/rtnetlink.h>
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#include <net/ipv6.h>
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#include <linux/atomic.h>
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/* IPv4 address key for cache lookups */
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struct ipv4_addr_key {
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__be32 addr;
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int vif;
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};
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#define INETPEER_MAXKEYSZ (sizeof(struct in6_addr) / sizeof(u32))
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struct inetpeer_addr {
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union {
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struct ipv4_addr_key a4;
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struct in6_addr a6;
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u32 key[INETPEER_MAXKEYSZ];
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};
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__u16 family;
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};
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struct inet_peer {
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/* group together avl_left,avl_right,v4daddr to speedup lookups */
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struct inet_peer __rcu *avl_left, *avl_right;
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struct inetpeer_addr daddr;
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__u32 avl_height;
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u32 metrics[RTAX_MAX];
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u32 rate_tokens; /* rate limiting for ICMP */
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u32 n_redirects;
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unsigned long rate_last;
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union {
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struct list_head gc_list;
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struct rcu_head gc_rcu;
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};
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/*
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* Once inet_peer is queued for deletion (refcnt == -1), following field
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* is not available: rid
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* We can share memory with rcu_head to help keep inet_peer small.
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*/
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union {
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struct {
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atomic_t rid; /* Frag reception counter */
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};
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struct rcu_head rcu;
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struct inet_peer *gc_next;
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};
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/* following fields might be frequently dirtied */
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__u32 dtime; /* the time of last use of not referenced entries */
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atomic_t refcnt;
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};
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struct inet_peer_base {
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struct inet_peer __rcu *root;
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seqlock_t lock;
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int total;
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};
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void inet_peer_base_init(struct inet_peer_base *);
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void inet_initpeers(void) __init;
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#define INETPEER_METRICS_NEW (~(u32) 0)
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static inline void inetpeer_set_addr_v4(struct inetpeer_addr *iaddr, __be32 ip)
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{
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iaddr->a4.addr = ip;
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iaddr->a4.vif = 0;
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iaddr->family = AF_INET;
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}
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static inline __be32 inetpeer_get_addr_v4(struct inetpeer_addr *iaddr)
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{
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return iaddr->a4.addr;
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}
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static inline void inetpeer_set_addr_v6(struct inetpeer_addr *iaddr,
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struct in6_addr *in6)
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{
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iaddr->a6 = *in6;
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iaddr->family = AF_INET6;
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}
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static inline struct in6_addr *inetpeer_get_addr_v6(struct inetpeer_addr *iaddr)
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{
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return &iaddr->a6;
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}
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/* can be called with or without local BH being disabled */
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struct inet_peer *inet_getpeer(struct inet_peer_base *base,
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const struct inetpeer_addr *daddr,
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int create);
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static inline struct inet_peer *inet_getpeer_v4(struct inet_peer_base *base,
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__be32 v4daddr,
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int vif, int create)
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{
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struct inetpeer_addr daddr;
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daddr.a4.addr = v4daddr;
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daddr.a4.vif = vif;
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daddr.family = AF_INET;
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return inet_getpeer(base, &daddr, create);
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}
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static inline struct inet_peer *inet_getpeer_v6(struct inet_peer_base *base,
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const struct in6_addr *v6daddr,
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int create)
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{
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struct inetpeer_addr daddr;
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daddr.a6 = *v6daddr;
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daddr.family = AF_INET6;
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return inet_getpeer(base, &daddr, create);
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}
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static inline int inetpeer_addr_cmp(const struct inetpeer_addr *a,
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const struct inetpeer_addr *b)
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{
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int i, n;
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if (a->family == AF_INET)
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n = sizeof(a->a4) / sizeof(u32);
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else
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n = sizeof(a->a6) / sizeof(u32);
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for (i = 0; i < n; i++) {
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if (a->key[i] == b->key[i])
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continue;
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if (a->key[i] < b->key[i])
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return -1;
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return 1;
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}
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return 0;
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}
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/* can be called from BH context or outside */
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void inet_putpeer(struct inet_peer *p);
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bool inet_peer_xrlim_allow(struct inet_peer *peer, int timeout);
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void inetpeer_invalidate_tree(struct inet_peer_base *);
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#endif /* _NET_INETPEER_H */
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