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]; | |
582a72da | 22 | }; |
7a71ed89 DM |
23 | }; |
24 | ||
25 | struct inetpeer_addr { | |
26 | struct inetpeer_addr_base addr; | |
27 | __u16 family; | |
8790ca17 | 28 | }; |
582a72da | 29 | |
fd2c3ef7 | 30 | struct inet_peer { |
78d79423 | 31 | /* group together avl_left,avl_right,v4daddr to speedup lookups */ |
b914c4ea | 32 | struct inet_peer __rcu *avl_left, *avl_right; |
8790ca17 | 33 | struct inetpeer_addr daddr; |
2c1409a0 | 34 | __u32 avl_height; |
2b77bdde ED |
35 | |
36 | u32 metrics[RTAX_MAX]; | |
37 | u32 rate_tokens; /* rate limiting for ICMP */ | |
de68dca1 | 38 | int redirect_genid; |
2b77bdde ED |
39 | unsigned long rate_last; |
40 | unsigned long pmtu_expires; | |
41 | u32 pmtu_orig; | |
42 | u32 pmtu_learned; | |
43 | struct inetpeer_addr_base redirect_learned; | |
317fe0e6 ED |
44 | /* |
45 | * Once inet_peer is queued for deletion (refcnt == -1), following fields | |
2b77bdde | 46 | * are not available: rid, ip_id_count, tcp_ts, tcp_ts_stamp |
60659823 | 47 | * We can share memory with rcu_head to help keep inet_peer small. |
317fe0e6 ED |
48 | */ |
49 | union { | |
50 | struct { | |
ddd4aa42 DM |
51 | atomic_t rid; /* Frag reception counter */ |
52 | atomic_t ip_id_count; /* IP ID for the next packet */ | |
53 | __u32 tcp_ts; | |
54 | __u32 tcp_ts_stamp; | |
317fe0e6 ED |
55 | }; |
56 | struct rcu_head rcu; | |
4b9d9be8 | 57 | struct inet_peer *gc_next; |
317fe0e6 | 58 | }; |
2b77bdde ED |
59 | |
60 | /* following fields might be frequently dirtied */ | |
61 | __u32 dtime; /* the time of last use of not referenced entries */ | |
62 | atomic_t refcnt; | |
1da177e4 LT |
63 | }; |
64 | ||
65 | void inet_initpeers(void) __init; | |
66 | ||
144001bd DM |
67 | #define INETPEER_METRICS_NEW (~(u32) 0) |
68 | ||
69 | static inline bool inet_metrics_new(const struct inet_peer *p) | |
70 | { | |
71 | return p->metrics[RTAX_LOCK-1] == INETPEER_METRICS_NEW; | |
72 | } | |
73 | ||
1da177e4 | 74 | /* can be called with or without local BH being disabled */ |
87c48fa3 | 75 | struct inet_peer *inet_getpeer(const struct inetpeer_addr *daddr, int create); |
b534ecf1 DM |
76 | |
77 | static inline struct inet_peer *inet_getpeer_v4(__be32 v4daddr, int create) | |
78 | { | |
8790ca17 | 79 | struct inetpeer_addr daddr; |
b534ecf1 | 80 | |
7a71ed89 | 81 | daddr.addr.a4 = v4daddr; |
b534ecf1 DM |
82 | daddr.family = AF_INET; |
83 | return inet_getpeer(&daddr, create); | |
84 | } | |
1da177e4 | 85 | |
b71d1d42 | 86 | static inline struct inet_peer *inet_getpeer_v6(const struct in6_addr *v6daddr, int create) |
672f007d | 87 | { |
8790ca17 | 88 | struct inetpeer_addr daddr; |
672f007d | 89 | |
4e3fd7a0 | 90 | *(struct in6_addr *)daddr.addr.a6 = *v6daddr; |
672f007d DM |
91 | daddr.family = AF_INET6; |
92 | return inet_getpeer(&daddr, create); | |
93 | } | |
94 | ||
1da177e4 | 95 | /* can be called from BH context or outside */ |
4663afe2 | 96 | extern void inet_putpeer(struct inet_peer *p); |
92d86829 | 97 | extern bool inet_peer_xrlim_allow(struct inet_peer *peer, int timeout); |
1da177e4 | 98 | |
317fe0e6 ED |
99 | /* |
100 | * temporary check to make sure we dont access rid, ip_id_count, tcp_ts, | |
101 | * tcp_ts_stamp if no refcount is taken on inet_peer | |
102 | */ | |
103 | static inline void inet_peer_refcheck(const struct inet_peer *p) | |
104 | { | |
105 | WARN_ON_ONCE(atomic_read(&p->refcnt) <= 0); | |
106 | } | |
107 | ||
108 | ||
1da177e4 | 109 | /* can be called with or without local BH being disabled */ |
87c48fa3 | 110 | static inline int inet_getid(struct inet_peer *p, int more) |
1da177e4 | 111 | { |
87c48fa3 | 112 | int old, new; |
2c1409a0 | 113 | more++; |
317fe0e6 | 114 | inet_peer_refcheck(p); |
87c48fa3 ED |
115 | do { |
116 | old = atomic_read(&p->ip_id_count); | |
117 | new = old + more; | |
118 | if (!new) | |
119 | new = 1; | |
120 | } while (atomic_cmpxchg(&p->ip_id_count, old, new) != old); | |
121 | return new; | |
1da177e4 LT |
122 | } |
123 | ||
124 | #endif /* _NET_INETPEER_H */ |