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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 */ | |
c09551c6 | 42 | u32 n_redirects; |
2b77bdde | 43 | unsigned long rate_last; |
317fe0e6 | 44 | /* |
1cc9a98b | 45 | * Once inet_peer is queued for deletion (refcnt == 0), following field |
73f156a6 | 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; | |
54 | }; | |
2b77bdde ED |
55 | |
56 | /* following fields might be frequently dirtied */ | |
57 | __u32 dtime; /* the time of last use of not referenced entries */ | |
1cc9a98b | 58 | refcount_t refcnt; |
1da177e4 LT |
59 | }; |
60 | ||
c3426b47 | 61 | struct inet_peer_base { |
b145425f | 62 | struct rb_root rb_root; |
c3426b47 DM |
63 | seqlock_t lock; |
64 | int total; | |
65 | }; | |
66 | ||
1fd51155 | 67 | void inet_peer_base_init(struct inet_peer_base *); |
c3426b47 | 68 | |
1fd51155 | 69 | void inet_initpeers(void) __init; |
1da177e4 | 70 | |
144001bd DM |
71 | #define INETPEER_METRICS_NEW (~(u32) 0) |
72 | ||
3abef286 DA |
73 | static inline void inetpeer_set_addr_v4(struct inetpeer_addr *iaddr, __be32 ip) |
74 | { | |
192132b9 | 75 | iaddr->a4.addr = ip; |
887dc9f2 | 76 | iaddr->a4.vif = 0; |
3abef286 DA |
77 | iaddr->family = AF_INET; |
78 | } | |
79 | ||
80 | static inline __be32 inetpeer_get_addr_v4(struct inetpeer_addr *iaddr) | |
81 | { | |
192132b9 | 82 | return iaddr->a4.addr; |
3abef286 DA |
83 | } |
84 | ||
85 | static inline void inetpeer_set_addr_v6(struct inetpeer_addr *iaddr, | |
86 | struct in6_addr *in6) | |
87 | { | |
5345c2e1 | 88 | iaddr->a6 = *in6; |
3abef286 DA |
89 | iaddr->family = AF_INET6; |
90 | } | |
91 | ||
92 | static inline struct in6_addr *inetpeer_get_addr_v6(struct inetpeer_addr *iaddr) | |
93 | { | |
5345c2e1 | 94 | return &iaddr->a6; |
3abef286 DA |
95 | } |
96 | ||
1da177e4 | 97 | /* can be called with or without local BH being disabled */ |
c0efc887 | 98 | struct inet_peer *inet_getpeer(struct inet_peer_base *base, |
c8a627ed G |
99 | const struct inetpeer_addr *daddr, |
100 | int create); | |
b534ecf1 | 101 | |
c0efc887 | 102 | static inline struct inet_peer *inet_getpeer_v4(struct inet_peer_base *base, |
54db0cc2 | 103 | __be32 v4daddr, |
192132b9 | 104 | int vif, int create) |
b534ecf1 | 105 | { |
8790ca17 | 106 | struct inetpeer_addr daddr; |
b534ecf1 | 107 | |
192132b9 DA |
108 | daddr.a4.addr = v4daddr; |
109 | daddr.a4.vif = vif; | |
b534ecf1 | 110 | daddr.family = AF_INET; |
c0efc887 | 111 | return inet_getpeer(base, &daddr, create); |
b534ecf1 | 112 | } |
1da177e4 | 113 | |
c0efc887 | 114 | static inline struct inet_peer *inet_getpeer_v6(struct inet_peer_base *base, |
54db0cc2 G |
115 | const struct in6_addr *v6daddr, |
116 | int create) | |
672f007d | 117 | { |
8790ca17 | 118 | struct inetpeer_addr daddr; |
672f007d | 119 | |
5345c2e1 | 120 | daddr.a6 = *v6daddr; |
672f007d | 121 | daddr.family = AF_INET6; |
c0efc887 | 122 | return inet_getpeer(base, &daddr, create); |
672f007d DM |
123 | } |
124 | ||
d39d14ff DA |
125 | static inline int inetpeer_addr_cmp(const struct inetpeer_addr *a, |
126 | const struct inetpeer_addr *b) | |
127 | { | |
5345c2e1 DA |
128 | int i, n; |
129 | ||
130 | if (a->family == AF_INET) | |
131 | n = sizeof(a->a4) / sizeof(u32); | |
132 | else | |
133 | n = sizeof(a->a6) / sizeof(u32); | |
d39d14ff DA |
134 | |
135 | for (i = 0; i < n; i++) { | |
5345c2e1 | 136 | if (a->key[i] == b->key[i]) |
d39d14ff | 137 | continue; |
5345c2e1 | 138 | if (a->key[i] < b->key[i]) |
d39d14ff DA |
139 | return -1; |
140 | return 1; | |
141 | } | |
142 | ||
143 | return 0; | |
144 | } | |
145 | ||
1da177e4 | 146 | /* can be called from BH context or outside */ |
1fd51155 JP |
147 | void inet_putpeer(struct inet_peer *p); |
148 | bool inet_peer_xrlim_allow(struct inet_peer *peer, int timeout); | |
1da177e4 | 149 | |
1fd51155 | 150 | void inetpeer_invalidate_tree(struct inet_peer_base *); |
5faa5df1 | 151 | |
1da177e4 | 152 | #endif /* _NET_INETPEER_H */ |