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1da177e4 LT |
1 | /* |
2 | * INETPEER - A storage for permanent information about peers | |
3 | * | |
1da177e4 LT |
4 | * Authors: Andrey V. Savochkin <saw@msu.ru> |
5 | */ | |
6 | ||
7 | #ifndef _NET_INETPEER_H | |
8 | #define _NET_INETPEER_H | |
9 | ||
10 | #include <linux/types.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/jiffies.h> | |
13 | #include <linux/spinlock.h> | |
14 | #include <asm/atomic.h> | |
15 | ||
fd2c3ef7 | 16 | struct inet_peer { |
78d79423 | 17 | /* group together avl_left,avl_right,v4daddr to speedup lookups */ |
b914c4ea | 18 | struct inet_peer __rcu *avl_left, *avl_right; |
78d79423 | 19 | __be32 v4daddr; /* peer's address */ |
2c1409a0 | 20 | __u32 avl_height; |
d71209de | 21 | struct list_head unused; |
4663afe2 | 22 | __u32 dtime; /* the time of last use of not |
1da177e4 LT |
23 | * referenced entries */ |
24 | atomic_t refcnt; | |
317fe0e6 ED |
25 | /* |
26 | * Once inet_peer is queued for deletion (refcnt == -1), following fields | |
27 | * are not available: rid, ip_id_count, tcp_ts, tcp_ts_stamp | |
28 | * We can share memory with rcu_head to keep inet_peer small | |
29 | * (less then 64 bytes) | |
30 | */ | |
31 | union { | |
32 | struct { | |
33 | atomic_t rid; /* Frag reception counter */ | |
34 | atomic_t ip_id_count; /* IP ID for the next packet */ | |
35 | __u32 tcp_ts; | |
36 | __u32 tcp_ts_stamp; | |
37 | }; | |
38 | struct rcu_head rcu; | |
39 | }; | |
1da177e4 LT |
40 | }; |
41 | ||
42 | void inet_initpeers(void) __init; | |
43 | ||
44 | /* can be called with or without local BH being disabled */ | |
53576d9b | 45 | struct inet_peer *inet_getpeer(__be32 daddr, int create); |
1da177e4 | 46 | |
1da177e4 | 47 | /* can be called from BH context or outside */ |
4663afe2 | 48 | extern void inet_putpeer(struct inet_peer *p); |
1da177e4 | 49 | |
317fe0e6 ED |
50 | /* |
51 | * temporary check to make sure we dont access rid, ip_id_count, tcp_ts, | |
52 | * tcp_ts_stamp if no refcount is taken on inet_peer | |
53 | */ | |
54 | static inline void inet_peer_refcheck(const struct inet_peer *p) | |
55 | { | |
56 | WARN_ON_ONCE(atomic_read(&p->refcnt) <= 0); | |
57 | } | |
58 | ||
59 | ||
1da177e4 LT |
60 | /* can be called with or without local BH being disabled */ |
61 | static inline __u16 inet_getid(struct inet_peer *p, int more) | |
62 | { | |
2c1409a0 | 63 | more++; |
317fe0e6 | 64 | inet_peer_refcheck(p); |
2c1409a0 | 65 | return atomic_add_return(more, &p->ip_id_count) - more; |
1da177e4 LT |
66 | } |
67 | ||
68 | #endif /* _NET_INETPEER_H */ |