Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * INETPEER - A storage for permanent information about peers
3 *
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>
14#include <linux/rtnetlink.h>
15#include <net/ipv6.h>
16#include <linux/atomic.h>
17
18/* IPv4 address key for cache lookups */
19struct ipv4_addr_key {
20 __be32 addr;
21 int vif;
22};
23
24#define INETPEER_MAXKEYSZ (sizeof(struct in6_addr) / sizeof(u32))
25
26struct inetpeer_addr {
27 union {
28 struct ipv4_addr_key a4;
29 struct in6_addr a6;
30 u32 key[INETPEER_MAXKEYSZ];
31 };
32 __u16 family;
33};
34
35struct inet_peer {
36 /* group together avl_left,avl_right,v4daddr to speedup lookups */
37 struct inet_peer __rcu *avl_left, *avl_right;
38 struct inetpeer_addr daddr;
39 __u32 avl_height;
40
41 u32 metrics[RTAX_MAX];
42 u32 rate_tokens; /* rate limiting for ICMP */
43 unsigned long rate_last;
44 union {
45 struct list_head gc_list;
46 struct rcu_head gc_rcu;
47 };
48 /*
49 * Once inet_peer is queued for deletion (refcnt == -1), following field
50 * is not available: rid
51 * We can share memory with rcu_head to help keep inet_peer small.
52 */
53 union {
54 struct {
55 atomic_t rid; /* Frag reception counter */
56 };
57 struct rcu_head rcu;
58 struct inet_peer *gc_next;
59 };
60
61 /* following fields might be frequently dirtied */
62 __u32 dtime; /* the time of last use of not referenced entries */
63 atomic_t refcnt;
64};
65
66struct inet_peer_base {
67 struct inet_peer __rcu *root;
68 seqlock_t lock;
69 int total;
70};
71
72void inet_peer_base_init(struct inet_peer_base *);
73
74void inet_initpeers(void) __init;
75
76#define INETPEER_METRICS_NEW (~(u32) 0)
77
78static inline void inetpeer_set_addr_v4(struct inetpeer_addr *iaddr, __be32 ip)
79{
80 iaddr->a4.addr = ip;
81 iaddr->family = AF_INET;
82}
83
84static inline __be32 inetpeer_get_addr_v4(struct inetpeer_addr *iaddr)
85{
86 return iaddr->a4.addr;
87}
88
89static inline void inetpeer_set_addr_v6(struct inetpeer_addr *iaddr,
90 struct in6_addr *in6)
91{
92 iaddr->a6 = *in6;
93 iaddr->family = AF_INET6;
94}
95
96static inline struct in6_addr *inetpeer_get_addr_v6(struct inetpeer_addr *iaddr)
97{
98 return &iaddr->a6;
99}
100
101/* can be called with or without local BH being disabled */
102struct inet_peer *inet_getpeer(struct inet_peer_base *base,
103 const struct inetpeer_addr *daddr,
104 int create);
105
106static inline struct inet_peer *inet_getpeer_v4(struct inet_peer_base *base,
107 __be32 v4daddr,
108 int vif, int create)
109{
110 struct inetpeer_addr daddr;
111
112 daddr.a4.addr = v4daddr;
113 daddr.a4.vif = vif;
114 daddr.family = AF_INET;
115 return inet_getpeer(base, &daddr, create);
116}
117
118static inline struct inet_peer *inet_getpeer_v6(struct inet_peer_base *base,
119 const struct in6_addr *v6daddr,
120 int create)
121{
122 struct inetpeer_addr daddr;
123
124 daddr.a6 = *v6daddr;
125 daddr.family = AF_INET6;
126 return inet_getpeer(base, &daddr, create);
127}
128
129static inline int inetpeer_addr_cmp(const struct inetpeer_addr *a,
130 const struct inetpeer_addr *b)
131{
132 int i, n;
133
134 if (a->family == AF_INET)
135 n = sizeof(a->a4) / sizeof(u32);
136 else
137 n = sizeof(a->a6) / sizeof(u32);
138
139 for (i = 0; i < n; i++) {
140 if (a->key[i] == b->key[i])
141 continue;
142 if (a->key[i] < b->key[i])
143 return -1;
144 return 1;
145 }
146
147 return 0;
148}
149
150/* can be called from BH context or outside */
151void inet_putpeer(struct inet_peer *p);
152bool inet_peer_xrlim_allow(struct inet_peer *peer, int timeout);
153
154void inetpeer_invalidate_tree(struct inet_peer_base *);
155
156#endif /* _NET_INETPEER_H */