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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> | |
60659823 | 14 | #include <linux/rtnetlink.h> |
672f007d | 15 | #include <net/ipv6.h> |
60063497 | 16 | #include <linux/atomic.h> |
1da177e4 | 17 | |
7a71ed89 | 18 | struct inetpeer_addr_base { |
582a72da | 19 | union { |
7a71ed89 DM |
20 | __be32 a4; |
21 | __be32 a6[4]; | |
8f55db48 | 22 | struct in6_addr in6; |
582a72da | 23 | }; |
7a71ed89 DM |
24 | }; |
25 | ||
26 | struct inetpeer_addr { | |
27 | struct inetpeer_addr_base addr; | |
28 | __u16 family; | |
8790ca17 | 29 | }; |
582a72da | 30 | |
fd2c3ef7 | 31 | struct inet_peer { |
78d79423 | 32 | /* group together avl_left,avl_right,v4daddr to speedup lookups */ |
b914c4ea | 33 | struct inet_peer __rcu *avl_left, *avl_right; |
8790ca17 | 34 | struct inetpeer_addr daddr; |
2c1409a0 | 35 | __u32 avl_height; |
2b77bdde ED |
36 | |
37 | u32 metrics[RTAX_MAX]; | |
38 | u32 rate_tokens; /* rate limiting for ICMP */ | |
39 | unsigned long rate_last; | |
55432d2b ED |
40 | union { |
41 | struct list_head gc_list; | |
42 | struct rcu_head gc_rcu; | |
43 | }; | |
317fe0e6 | 44 | /* |
73f156a6 ED |
45 | * Once inet_peer is queued for deletion (refcnt == -1), following field |
46 | * is not available: rid | |
60659823 | 47 | * We can share memory with rcu_head to help keep inet_peer small. |
317fe0e6 ED |
48 | */ |
49 | union { | |
50 | struct { | |
ddd4aa42 | 51 | atomic_t rid; /* Frag reception counter */ |
317fe0e6 ED |
52 | }; |
53 | struct rcu_head rcu; | |
4b9d9be8 | 54 | struct inet_peer *gc_next; |
317fe0e6 | 55 | }; |
2b77bdde ED |
56 | |
57 | /* following fields might be frequently dirtied */ | |
58 | __u32 dtime; /* the time of last use of not referenced entries */ | |
59 | atomic_t refcnt; | |
1da177e4 LT |
60 | }; |
61 | ||
c3426b47 DM |
62 | struct inet_peer_base { |
63 | struct inet_peer __rcu *root; | |
64 | seqlock_t lock; | |
65 | int total; | |
66 | }; | |
67 | ||
1fd51155 | 68 | void inet_peer_base_init(struct inet_peer_base *); |
c3426b47 | 69 | |
1fd51155 | 70 | void inet_initpeers(void) __init; |
1da177e4 | 71 | |
144001bd DM |
72 | #define INETPEER_METRICS_NEW (~(u32) 0) |
73 | ||
1da177e4 | 74 | /* can be called with or without local BH being disabled */ |
c0efc887 | 75 | struct inet_peer *inet_getpeer(struct inet_peer_base *base, |
c8a627ed G |
76 | const struct inetpeer_addr *daddr, |
77 | int create); | |
b534ecf1 | 78 | |
c0efc887 | 79 | static inline struct inet_peer *inet_getpeer_v4(struct inet_peer_base *base, |
54db0cc2 G |
80 | __be32 v4daddr, |
81 | int create) | |
b534ecf1 | 82 | { |
8790ca17 | 83 | struct inetpeer_addr daddr; |
b534ecf1 | 84 | |
7a71ed89 | 85 | daddr.addr.a4 = v4daddr; |
b534ecf1 | 86 | daddr.family = AF_INET; |
c0efc887 | 87 | return inet_getpeer(base, &daddr, create); |
b534ecf1 | 88 | } |
1da177e4 | 89 | |
c0efc887 | 90 | static inline struct inet_peer *inet_getpeer_v6(struct inet_peer_base *base, |
54db0cc2 G |
91 | const struct in6_addr *v6daddr, |
92 | int create) | |
672f007d | 93 | { |
8790ca17 | 94 | struct inetpeer_addr daddr; |
672f007d | 95 | |
8f55db48 | 96 | daddr.addr.in6 = *v6daddr; |
672f007d | 97 | daddr.family = AF_INET6; |
c0efc887 | 98 | return inet_getpeer(base, &daddr, create); |
672f007d DM |
99 | } |
100 | ||
1da177e4 | 101 | /* can be called from BH context or outside */ |
1fd51155 JP |
102 | void inet_putpeer(struct inet_peer *p); |
103 | bool inet_peer_xrlim_allow(struct inet_peer *peer, int timeout); | |
1da177e4 | 104 | |
1fd51155 | 105 | void inetpeer_invalidate_tree(struct inet_peer_base *); |
5faa5df1 | 106 | |
1da177e4 | 107 | #endif /* _NET_INETPEER_H */ |