Commit | Line | Data |
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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> | |
672f007d | 14 | #include <net/ipv6.h> |
1da177e4 LT |
15 | #include <asm/atomic.h> |
16 | ||
8790ca17 | 17 | struct inetpeer_addr { |
582a72da DM |
18 | union { |
19 | __be32 a4; | |
20 | __be32 a6[4]; | |
21 | }; | |
22 | __u16 family; | |
8790ca17 | 23 | }; |
582a72da | 24 | |
fd2c3ef7 | 25 | struct inet_peer { |
78d79423 | 26 | /* group together avl_left,avl_right,v4daddr to speedup lookups */ |
b914c4ea | 27 | struct inet_peer __rcu *avl_left, *avl_right; |
8790ca17 | 28 | struct inetpeer_addr daddr; |
2c1409a0 | 29 | __u32 avl_height; |
d71209de | 30 | struct list_head unused; |
4663afe2 | 31 | __u32 dtime; /* the time of last use of not |
1da177e4 LT |
32 | * referenced entries */ |
33 | atomic_t refcnt; | |
317fe0e6 ED |
34 | /* |
35 | * Once inet_peer is queued for deletion (refcnt == -1), following fields | |
36 | * are not available: rid, ip_id_count, tcp_ts, tcp_ts_stamp | |
37 | * We can share memory with rcu_head to keep inet_peer small | |
317fe0e6 ED |
38 | */ |
39 | union { | |
40 | struct { | |
41 | atomic_t rid; /* Frag reception counter */ | |
42 | atomic_t ip_id_count; /* IP ID for the next packet */ | |
43 | __u32 tcp_ts; | |
44 | __u32 tcp_ts_stamp; | |
45 | }; | |
46 | struct rcu_head rcu; | |
47 | }; | |
1da177e4 LT |
48 | }; |
49 | ||
50 | void inet_initpeers(void) __init; | |
51 | ||
52 | /* can be called with or without local BH being disabled */ | |
8790ca17 | 53 | struct inet_peer *inet_getpeer(struct inetpeer_addr *daddr, int create); |
b534ecf1 DM |
54 | |
55 | static inline struct inet_peer *inet_getpeer_v4(__be32 v4daddr, int create) | |
56 | { | |
8790ca17 | 57 | struct inetpeer_addr daddr; |
b534ecf1 DM |
58 | |
59 | daddr.a4 = v4daddr; | |
60 | daddr.family = AF_INET; | |
61 | return inet_getpeer(&daddr, create); | |
62 | } | |
1da177e4 | 63 | |
672f007d DM |
64 | static inline struct inet_peer *inet_getpeer_v6(struct in6_addr *v6daddr, int create) |
65 | { | |
8790ca17 | 66 | struct inetpeer_addr daddr; |
672f007d DM |
67 | |
68 | ipv6_addr_copy((struct in6_addr *)daddr.a6, v6daddr); | |
69 | daddr.family = AF_INET6; | |
70 | return inet_getpeer(&daddr, create); | |
71 | } | |
72 | ||
1da177e4 | 73 | /* can be called from BH context or outside */ |
4663afe2 | 74 | extern void inet_putpeer(struct inet_peer *p); |
1da177e4 | 75 | |
317fe0e6 ED |
76 | /* |
77 | * temporary check to make sure we dont access rid, ip_id_count, tcp_ts, | |
78 | * tcp_ts_stamp if no refcount is taken on inet_peer | |
79 | */ | |
80 | static inline void inet_peer_refcheck(const struct inet_peer *p) | |
81 | { | |
82 | WARN_ON_ONCE(atomic_read(&p->refcnt) <= 0); | |
83 | } | |
84 | ||
85 | ||
1da177e4 LT |
86 | /* can be called with or without local BH being disabled */ |
87 | static inline __u16 inet_getid(struct inet_peer *p, int more) | |
88 | { | |
2c1409a0 | 89 | more++; |
317fe0e6 | 90 | inet_peer_refcheck(p); |
2c1409a0 | 91 | return atomic_add_return(more, &p->ip_id_count) - more; |
1da177e4 LT |
92 | } |
93 | ||
94 | #endif /* _NET_INETPEER_H */ |