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Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | /* |
3 | * INETPEER - A storage for permanent information about peers | |
4 | * | |
1da177e4 LT |
5 | * Authors: Andrey V. Savochkin <saw@msu.ru> |
6 | */ | |
7 | ||
8 | #ifndef _NET_INETPEER_H | |
9 | #define _NET_INETPEER_H | |
10 | ||
11 | #include <linux/types.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/jiffies.h> | |
14 | #include <linux/spinlock.h> | |
60659823 | 15 | #include <linux/rtnetlink.h> |
672f007d | 16 | #include <net/ipv6.h> |
60063497 | 17 | #include <linux/atomic.h> |
1da177e4 | 18 | |
192132b9 DA |
19 | /* IPv4 address key for cache lookups */ |
20 | struct ipv4_addr_key { | |
21 | __be32 addr; | |
22 | int vif; | |
23 | }; | |
24 | ||
5345c2e1 DA |
25 | #define INETPEER_MAXKEYSZ (sizeof(struct in6_addr) / sizeof(u32)) |
26 | ||
27 | struct inetpeer_addr { | |
582a72da | 28 | union { |
192132b9 | 29 | struct ipv4_addr_key a4; |
5345c2e1 DA |
30 | struct in6_addr a6; |
31 | u32 key[INETPEER_MAXKEYSZ]; | |
582a72da | 32 | }; |
7a71ed89 | 33 | __u16 family; |
8790ca17 | 34 | }; |
582a72da | 35 | |
fd2c3ef7 | 36 | struct inet_peer { |
b145425f | 37 | struct rb_node rb_node; |
8790ca17 | 38 | struct inetpeer_addr daddr; |
2b77bdde ED |
39 | |
40 | u32 metrics[RTAX_MAX]; | |
41 | u32 rate_tokens; /* rate limiting for ICMP */ | |
42 | unsigned long rate_last; | |
317fe0e6 | 43 | /* |
1cc9a98b | 44 | * Once inet_peer is queued for deletion (refcnt == 0), following field |
73f156a6 | 45 | * is not available: rid |
60659823 | 46 | * We can share memory with rcu_head to help keep inet_peer small. |
317fe0e6 ED |
47 | */ |
48 | union { | |
49 | struct { | |
ddd4aa42 | 50 | atomic_t rid; /* Frag reception counter */ |
317fe0e6 ED |
51 | }; |
52 | struct rcu_head rcu; | |
53 | }; | |
2b77bdde ED |
54 | |
55 | /* following fields might be frequently dirtied */ | |
56 | __u32 dtime; /* the time of last use of not referenced entries */ | |
1cc9a98b | 57 | refcount_t refcnt; |
1da177e4 LT |
58 | }; |
59 | ||
c3426b47 | 60 | struct inet_peer_base { |
b145425f | 61 | struct rb_root rb_root; |
c3426b47 DM |
62 | seqlock_t lock; |
63 | int total; | |
64 | }; | |
65 | ||
1fd51155 | 66 | void inet_peer_base_init(struct inet_peer_base *); |
c3426b47 | 67 | |
1fd51155 | 68 | void inet_initpeers(void) __init; |
1da177e4 | 69 | |
144001bd DM |
70 | #define INETPEER_METRICS_NEW (~(u32) 0) |
71 | ||
3abef286 DA |
72 | static inline void inetpeer_set_addr_v4(struct inetpeer_addr *iaddr, __be32 ip) |
73 | { | |
192132b9 | 74 | iaddr->a4.addr = ip; |
887dc9f2 | 75 | iaddr->a4.vif = 0; |
3abef286 DA |
76 | iaddr->family = AF_INET; |
77 | } | |
78 | ||
79 | static inline __be32 inetpeer_get_addr_v4(struct inetpeer_addr *iaddr) | |
80 | { | |
192132b9 | 81 | return iaddr->a4.addr; |
3abef286 DA |
82 | } |
83 | ||
84 | static inline void inetpeer_set_addr_v6(struct inetpeer_addr *iaddr, | |
85 | struct in6_addr *in6) | |
86 | { | |
5345c2e1 | 87 | iaddr->a6 = *in6; |
3abef286 DA |
88 | iaddr->family = AF_INET6; |
89 | } | |
90 | ||
91 | static inline struct in6_addr *inetpeer_get_addr_v6(struct inetpeer_addr *iaddr) | |
92 | { | |
5345c2e1 | 93 | return &iaddr->a6; |
3abef286 DA |
94 | } |
95 | ||
1da177e4 | 96 | /* can be called with or without local BH being disabled */ |
c0efc887 | 97 | struct inet_peer *inet_getpeer(struct inet_peer_base *base, |
c8a627ed G |
98 | const struct inetpeer_addr *daddr, |
99 | int create); | |
b534ecf1 | 100 | |
c0efc887 | 101 | static inline struct inet_peer *inet_getpeer_v4(struct inet_peer_base *base, |
54db0cc2 | 102 | __be32 v4daddr, |
192132b9 | 103 | int vif, int create) |
b534ecf1 | 104 | { |
8790ca17 | 105 | struct inetpeer_addr daddr; |
b534ecf1 | 106 | |
192132b9 DA |
107 | daddr.a4.addr = v4daddr; |
108 | daddr.a4.vif = vif; | |
b534ecf1 | 109 | daddr.family = AF_INET; |
c0efc887 | 110 | return inet_getpeer(base, &daddr, create); |
b534ecf1 | 111 | } |
1da177e4 | 112 | |
c0efc887 | 113 | static inline struct inet_peer *inet_getpeer_v6(struct inet_peer_base *base, |
54db0cc2 G |
114 | const struct in6_addr *v6daddr, |
115 | int create) | |
672f007d | 116 | { |
8790ca17 | 117 | struct inetpeer_addr daddr; |
672f007d | 118 | |
5345c2e1 | 119 | daddr.a6 = *v6daddr; |
672f007d | 120 | daddr.family = AF_INET6; |
c0efc887 | 121 | return inet_getpeer(base, &daddr, create); |
672f007d DM |
122 | } |
123 | ||
d39d14ff DA |
124 | static inline int inetpeer_addr_cmp(const struct inetpeer_addr *a, |
125 | const struct inetpeer_addr *b) | |
126 | { | |
5345c2e1 DA |
127 | int i, n; |
128 | ||
129 | if (a->family == AF_INET) | |
130 | n = sizeof(a->a4) / sizeof(u32); | |
131 | else | |
132 | n = sizeof(a->a6) / sizeof(u32); | |
d39d14ff DA |
133 | |
134 | for (i = 0; i < n; i++) { | |
5345c2e1 | 135 | if (a->key[i] == b->key[i]) |
d39d14ff | 136 | continue; |
5345c2e1 | 137 | if (a->key[i] < b->key[i]) |
d39d14ff DA |
138 | return -1; |
139 | return 1; | |
140 | } | |
141 | ||
142 | return 0; | |
143 | } | |
144 | ||
1da177e4 | 145 | /* can be called from BH context or outside */ |
1fd51155 JP |
146 | void inet_putpeer(struct inet_peer *p); |
147 | bool inet_peer_xrlim_allow(struct inet_peer *peer, int timeout); | |
1da177e4 | 148 | |
1fd51155 | 149 | void inetpeer_invalidate_tree(struct inet_peer_base *); |
5faa5df1 | 150 | |
1da177e4 | 151 | #endif /* _NET_INETPEER_H */ |