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 */
19 struct ipv4_addr_key {
20 __be32 addr;
21 int vif;
22 };
23
24 #define INETPEER_MAXKEYSZ (sizeof(struct in6_addr) / sizeof(u32))
25
26 struct 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
35 struct 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 u32 n_redirects;
44 unsigned long rate_last;
45 union {
46 struct list_head gc_list;
47 struct rcu_head gc_rcu;
48 };
49 /*
50 * Once inet_peer is queued for deletion (refcnt == -1), following field
51 * is not available: rid
52 * We can share memory with rcu_head to help keep inet_peer small.
53 */
54 union {
55 struct {
56 atomic_t rid; /* Frag reception counter */
57 };
58 struct rcu_head rcu;
59 struct inet_peer *gc_next;
60 };
61
62 /* following fields might be frequently dirtied */
63 __u32 dtime; /* the time of last use of not referenced entries */
64 atomic_t refcnt;
65 };
66
67 struct inet_peer_base {
68 struct inet_peer __rcu *root;
69 seqlock_t lock;
70 int total;
71 };
72
73 void inet_peer_base_init(struct inet_peer_base *);
74
75 void inet_initpeers(void) __init;
76
77 #define INETPEER_METRICS_NEW (~(u32) 0)
78
inetpeer_set_addr_v4(struct inetpeer_addr * iaddr,__be32 ip)79 static inline void inetpeer_set_addr_v4(struct inetpeer_addr *iaddr, __be32 ip)
80 {
81 iaddr->a4.addr = ip;
82 iaddr->a4.vif = 0;
83 iaddr->family = AF_INET;
84 }
85
inetpeer_get_addr_v4(struct inetpeer_addr * iaddr)86 static inline __be32 inetpeer_get_addr_v4(struct inetpeer_addr *iaddr)
87 {
88 return iaddr->a4.addr;
89 }
90
inetpeer_set_addr_v6(struct inetpeer_addr * iaddr,struct in6_addr * in6)91 static inline void inetpeer_set_addr_v6(struct inetpeer_addr *iaddr,
92 struct in6_addr *in6)
93 {
94 iaddr->a6 = *in6;
95 iaddr->family = AF_INET6;
96 }
97
inetpeer_get_addr_v6(struct inetpeer_addr * iaddr)98 static inline struct in6_addr *inetpeer_get_addr_v6(struct inetpeer_addr *iaddr)
99 {
100 return &iaddr->a6;
101 }
102
103 /* can be called with or without local BH being disabled */
104 struct inet_peer *inet_getpeer(struct inet_peer_base *base,
105 const struct inetpeer_addr *daddr,
106 int create);
107
inet_getpeer_v4(struct inet_peer_base * base,__be32 v4daddr,int vif,int create)108 static inline struct inet_peer *inet_getpeer_v4(struct inet_peer_base *base,
109 __be32 v4daddr,
110 int vif, int create)
111 {
112 struct inetpeer_addr daddr;
113
114 daddr.a4.addr = v4daddr;
115 daddr.a4.vif = vif;
116 daddr.family = AF_INET;
117 return inet_getpeer(base, &daddr, create);
118 }
119
inet_getpeer_v6(struct inet_peer_base * base,const struct in6_addr * v6daddr,int create)120 static inline struct inet_peer *inet_getpeer_v6(struct inet_peer_base *base,
121 const struct in6_addr *v6daddr,
122 int create)
123 {
124 struct inetpeer_addr daddr;
125
126 daddr.a6 = *v6daddr;
127 daddr.family = AF_INET6;
128 return inet_getpeer(base, &daddr, create);
129 }
130
inetpeer_addr_cmp(const struct inetpeer_addr * a,const struct inetpeer_addr * b)131 static inline int inetpeer_addr_cmp(const struct inetpeer_addr *a,
132 const struct inetpeer_addr *b)
133 {
134 int i, n;
135
136 if (a->family == AF_INET)
137 n = sizeof(a->a4) / sizeof(u32);
138 else
139 n = sizeof(a->a6) / sizeof(u32);
140
141 for (i = 0; i < n; i++) {
142 if (a->key[i] == b->key[i])
143 continue;
144 if (a->key[i] < b->key[i])
145 return -1;
146 return 1;
147 }
148
149 return 0;
150 }
151
152 /* can be called from BH context or outside */
153 void inet_putpeer(struct inet_peer *p);
154 bool inet_peer_xrlim_allow(struct inet_peer *peer, int timeout);
155
156 void inetpeer_invalidate_tree(struct inet_peer_base *);
157
158 #endif /* _NET_INETPEER_H */
159