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1 | /* |
2 | * INETPEER - A storage for permanent information about peers |
3 | * |
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 | |
16 | struct inet_peer { |
17 | /* group together avl_left,avl_right,v4daddr to speedup lookups */ |
18 | struct inet_peer __rcu *avl_left, *avl_right; |
19 | __be32 v4daddr; /* peer's address */ |
20 | __u32 avl_height; |
21 | struct list_head unused; |
22 | __u32 dtime; /* the time of last use of not |
23 | * referenced entries */ |
24 | atomic_t refcnt; |
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 | }; |
40 | }; |
41 | |
42 | void inet_initpeers(void) __init; |
43 | |
44 | /* can be called with or without local BH being disabled */ |
45 | struct inet_peer *inet_getpeer(__be32 daddr, int create); |
46 | |
47 | /* can be called from BH context or outside */ |
48 | extern void inet_putpeer(struct inet_peer *p); |
49 | |
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 | |
60 | /* can be called with or without local BH being disabled */ |
61 | static inline __u16 inet_getid(struct inet_peer *p, int more) |
62 | { |
63 | more++; |
64 | inet_peer_refcheck(p); |
65 | return atomic_add_return(more, &p->ip_id_count) - more; |
66 | } |
67 | |
68 | #endif /* _NET_INETPEER_H */ |
69 |
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