Commit | Line | Data |
---|---|---|
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 | |
192132b9 DA |
18 | /* IPv4 address key for cache lookups */ |
19 | struct ipv4_addr_key { | |
20 | __be32 addr; | |
21 | int vif; | |
22 | }; | |
23 | ||
5345c2e1 DA |
24 | #define INETPEER_MAXKEYSZ (sizeof(struct in6_addr) / sizeof(u32)) |
25 | ||
26 | struct inetpeer_addr { | |
582a72da | 27 | union { |
192132b9 | 28 | struct ipv4_addr_key a4; |
5345c2e1 DA |
29 | struct in6_addr a6; |
30 | u32 key[INETPEER_MAXKEYSZ]; | |
582a72da | 31 | }; |
7a71ed89 | 32 | __u16 family; |
8790ca17 | 33 | }; |
582a72da | 34 | |
fd2c3ef7 | 35 | struct inet_peer { |
b145425f | 36 | struct rb_node rb_node; |
8790ca17 | 37 | struct inetpeer_addr daddr; |
2b77bdde ED |
38 | |
39 | u32 metrics[RTAX_MAX]; | |
40 | u32 rate_tokens; /* rate limiting for ICMP */ | |
41 | unsigned long rate_last; | |
317fe0e6 | 42 | /* |
1cc9a98b | 43 | * Once inet_peer is queued for deletion (refcnt == 0), following field |
73f156a6 | 44 | * is not available: rid |
60659823 | 45 | * We can share memory with rcu_head to help keep inet_peer small. |
317fe0e6 ED |
46 | */ |
47 | union { | |
48 | struct { | |
ddd4aa42 | 49 | atomic_t rid; /* Frag reception counter */ |
317fe0e6 ED |
50 | }; |
51 | struct rcu_head rcu; | |
52 | }; | |
2b77bdde ED |
53 | |
54 | /* following fields might be frequently dirtied */ | |
55 | __u32 dtime; /* the time of last use of not referenced entries */ | |
1cc9a98b | 56 | refcount_t refcnt; |
1da177e4 LT |
57 | }; |
58 | ||
c3426b47 | 59 | struct inet_peer_base { |
b145425f | 60 | struct rb_root rb_root; |
c3426b47 DM |
61 | seqlock_t lock; |
62 | int total; | |
63 | }; | |
64 | ||
1fd51155 | 65 | void inet_peer_base_init(struct inet_peer_base *); |
c3426b47 | 66 | |
1fd51155 | 67 | void inet_initpeers(void) __init; |
1da177e4 | 68 | |
144001bd DM |
69 | #define INETPEER_METRICS_NEW (~(u32) 0) |
70 | ||
3abef286 DA |
71 | static inline void inetpeer_set_addr_v4(struct inetpeer_addr *iaddr, __be32 ip) |
72 | { | |
192132b9 | 73 | iaddr->a4.addr = ip; |
887dc9f2 | 74 | iaddr->a4.vif = 0; |
3abef286 DA |
75 | iaddr->family = AF_INET; |
76 | } | |
77 | ||
78 | static inline __be32 inetpeer_get_addr_v4(struct inetpeer_addr *iaddr) | |
79 | { | |
192132b9 | 80 | return iaddr->a4.addr; |
3abef286 DA |
81 | } |
82 | ||
83 | static inline void inetpeer_set_addr_v6(struct inetpeer_addr *iaddr, | |
84 | struct in6_addr *in6) | |
85 | { | |
5345c2e1 | 86 | iaddr->a6 = *in6; |
3abef286 DA |
87 | iaddr->family = AF_INET6; |
88 | } | |
89 | ||
90 | static inline struct in6_addr *inetpeer_get_addr_v6(struct inetpeer_addr *iaddr) | |
91 | { | |
5345c2e1 | 92 | return &iaddr->a6; |
3abef286 DA |
93 | } |
94 | ||
1da177e4 | 95 | /* can be called with or without local BH being disabled */ |
c0efc887 | 96 | struct inet_peer *inet_getpeer(struct inet_peer_base *base, |
c8a627ed G |
97 | const struct inetpeer_addr *daddr, |
98 | int create); | |
b534ecf1 | 99 | |
c0efc887 | 100 | static inline struct inet_peer *inet_getpeer_v4(struct inet_peer_base *base, |
54db0cc2 | 101 | __be32 v4daddr, |
192132b9 | 102 | int vif, int create) |
b534ecf1 | 103 | { |
8790ca17 | 104 | struct inetpeer_addr daddr; |
b534ecf1 | 105 | |
192132b9 DA |
106 | daddr.a4.addr = v4daddr; |
107 | daddr.a4.vif = vif; | |
b534ecf1 | 108 | daddr.family = AF_INET; |
c0efc887 | 109 | return inet_getpeer(base, &daddr, create); |
b534ecf1 | 110 | } |
1da177e4 | 111 | |
c0efc887 | 112 | static inline struct inet_peer *inet_getpeer_v6(struct inet_peer_base *base, |
54db0cc2 G |
113 | const struct in6_addr *v6daddr, |
114 | int create) | |
672f007d | 115 | { |
8790ca17 | 116 | struct inetpeer_addr daddr; |
672f007d | 117 | |
5345c2e1 | 118 | daddr.a6 = *v6daddr; |
672f007d | 119 | daddr.family = AF_INET6; |
c0efc887 | 120 | return inet_getpeer(base, &daddr, create); |
672f007d DM |
121 | } |
122 | ||
d39d14ff DA |
123 | static inline int inetpeer_addr_cmp(const struct inetpeer_addr *a, |
124 | const struct inetpeer_addr *b) | |
125 | { | |
5345c2e1 DA |
126 | int i, n; |
127 | ||
128 | if (a->family == AF_INET) | |
129 | n = sizeof(a->a4) / sizeof(u32); | |
130 | else | |
131 | n = sizeof(a->a6) / sizeof(u32); | |
d39d14ff DA |
132 | |
133 | for (i = 0; i < n; i++) { | |
5345c2e1 | 134 | if (a->key[i] == b->key[i]) |
d39d14ff | 135 | continue; |
5345c2e1 | 136 | if (a->key[i] < b->key[i]) |
d39d14ff DA |
137 | return -1; |
138 | return 1; | |
139 | } | |
140 | ||
141 | return 0; | |
142 | } | |
143 | ||
1da177e4 | 144 | /* can be called from BH context or outside */ |
1fd51155 JP |
145 | void inet_putpeer(struct inet_peer *p); |
146 | bool inet_peer_xrlim_allow(struct inet_peer *peer, int timeout); | |
1da177e4 | 147 | |
1fd51155 | 148 | void inetpeer_invalidate_tree(struct inet_peer_base *); |
5faa5df1 | 149 | |
1da177e4 | 150 | #endif /* _NET_INETPEER_H */ |