2 * INETPEER - A storage for permanent information about peers
4 * Authors: Andrey V. Savochkin <saw@msu.ru>
7 #ifndef _NET_INETPEER_H
8 #define _NET_INETPEER_H
10 #include <linux/types.h>
11 #include <linux/init.h>
12 #include <linux/jiffies.h>
13 #include <linux/spinlock.h>
14 #include <linux/rtnetlink.h>
16 #include <linux/atomic.h>
18 /* IPv4 address key for cache lookups */
19 struct ipv4_addr_key {
24 #define INETPEER_MAXKEYSZ (sizeof(struct in6_addr) / sizeof(u32))
26 struct inetpeer_addr {
28 struct ipv4_addr_key a4;
30 u32 key[INETPEER_MAXKEYSZ];
36 /* group together avl_left,avl_right,v4daddr to speedup lookups */
37 struct inet_peer __rcu *avl_left, *avl_right;
38 struct inetpeer_addr daddr;
41 u32 metrics[RTAX_MAX];
42 u32 rate_tokens; /* rate limiting for ICMP */
43 unsigned long rate_last;
45 struct list_head gc_list;
46 struct rcu_head gc_rcu;
49 * Once inet_peer is queued for deletion (refcnt == -1), following field
50 * is not available: rid
51 * We can share memory with rcu_head to help keep inet_peer small.
55 atomic_t rid; /* Frag reception counter */
58 struct inet_peer *gc_next;
61 /* following fields might be frequently dirtied */
62 __u32 dtime; /* the time of last use of not referenced entries */
66 struct inet_peer_base {
67 struct inet_peer __rcu *root;
72 void inet_peer_base_init(struct inet_peer_base *);
74 void inet_initpeers(void) __init;
76 #define INETPEER_METRICS_NEW (~(u32) 0)
78 static inline void inetpeer_set_addr_v4(struct inetpeer_addr *iaddr, __be32 ip)
81 iaddr->family = AF_INET;
84 static inline __be32 inetpeer_get_addr_v4(struct inetpeer_addr *iaddr)
86 return iaddr->a4.addr;
89 static inline void inetpeer_set_addr_v6(struct inetpeer_addr *iaddr,
93 iaddr->family = AF_INET6;
96 static inline struct in6_addr *inetpeer_get_addr_v6(struct inetpeer_addr *iaddr)
101 /* can be called with or without local BH being disabled */
102 struct inet_peer *inet_getpeer(struct inet_peer_base *base,
103 const struct inetpeer_addr *daddr,
106 static inline struct inet_peer *inet_getpeer_v4(struct inet_peer_base *base,
110 struct inetpeer_addr daddr;
112 daddr.a4.addr = v4daddr;
114 daddr.family = AF_INET;
115 return inet_getpeer(base, &daddr, create);
118 static inline struct inet_peer *inet_getpeer_v6(struct inet_peer_base *base,
119 const struct in6_addr *v6daddr,
122 struct inetpeer_addr daddr;
125 daddr.family = AF_INET6;
126 return inet_getpeer(base, &daddr, create);
129 static inline int inetpeer_addr_cmp(const struct inetpeer_addr *a,
130 const struct inetpeer_addr *b)
134 if (a->family == AF_INET)
135 n = sizeof(a->a4) / sizeof(u32);
137 n = sizeof(a->a6) / sizeof(u32);
139 for (i = 0; i < n; i++) {
140 if (a->key[i] == b->key[i])
142 if (a->key[i] < b->key[i])
150 /* can be called from BH context or outside */
151 void inet_putpeer(struct inet_peer *p);
152 bool inet_peer_xrlim_allow(struct inet_peer *peer, int timeout);
154 void inetpeer_invalidate_tree(struct inet_peer_base *);
156 #endif /* _NET_INETPEER_H */