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Commit | Line | Data |
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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 | |
7a71ed89 | 18 | struct inetpeer_addr_base { |
582a72da | 19 | union { |
7a71ed89 DM |
20 | __be32 a4; |
21 | __be32 a6[4]; | |
582a72da | 22 | }; |
7a71ed89 DM |
23 | }; |
24 | ||
25 | struct inetpeer_addr { | |
26 | struct inetpeer_addr_base addr; | |
27 | __u16 family; | |
8790ca17 | 28 | }; |
582a72da | 29 | |
fd2c3ef7 | 30 | struct inet_peer { |
78d79423 | 31 | /* group together avl_left,avl_right,v4daddr to speedup lookups */ |
b914c4ea | 32 | struct inet_peer __rcu *avl_left, *avl_right; |
8790ca17 | 33 | struct inetpeer_addr daddr; |
2c1409a0 | 34 | __u32 avl_height; |
2b77bdde ED |
35 | |
36 | u32 metrics[RTAX_MAX]; | |
37 | u32 rate_tokens; /* rate limiting for ICMP */ | |
38 | unsigned long rate_last; | |
55432d2b ED |
39 | union { |
40 | struct list_head gc_list; | |
41 | struct rcu_head gc_rcu; | |
42 | }; | |
317fe0e6 | 43 | /* |
73f156a6 ED |
44 | * Once inet_peer is queued for deletion (refcnt == -1), following field |
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; | |
4b9d9be8 | 53 | struct inet_peer *gc_next; |
317fe0e6 | 54 | }; |
2b77bdde ED |
55 | |
56 | /* following fields might be frequently dirtied */ | |
57 | __u32 dtime; /* the time of last use of not referenced entries */ | |
58 | atomic_t refcnt; | |
1da177e4 LT |
59 | }; |
60 | ||
c3426b47 DM |
61 | struct inet_peer_base { |
62 | struct inet_peer __rcu *root; | |
63 | seqlock_t lock; | |
64 | int total; | |
65 | }; | |
66 | ||
97bab73f DM |
67 | #define INETPEER_BASE_BIT 0x1UL |
68 | ||
69 | static inline struct inet_peer *inetpeer_ptr(unsigned long val) | |
70 | { | |
71 | BUG_ON(val & INETPEER_BASE_BIT); | |
72 | return (struct inet_peer *) val; | |
73 | } | |
74 | ||
75 | static inline struct inet_peer_base *inetpeer_base_ptr(unsigned long val) | |
76 | { | |
77 | if (!(val & INETPEER_BASE_BIT)) | |
78 | return NULL; | |
79 | val &= ~INETPEER_BASE_BIT; | |
80 | return (struct inet_peer_base *) val; | |
81 | } | |
82 | ||
83 | static inline bool inetpeer_ptr_is_peer(unsigned long val) | |
84 | { | |
85 | return !(val & INETPEER_BASE_BIT); | |
86 | } | |
87 | ||
88 | static inline void __inetpeer_ptr_set_peer(unsigned long *val, struct inet_peer *peer) | |
89 | { | |
90 | /* This implicitly clears INETPEER_BASE_BIT */ | |
91 | *val = (unsigned long) peer; | |
92 | } | |
93 | ||
94 | static inline bool inetpeer_ptr_set_peer(unsigned long *ptr, struct inet_peer *peer) | |
95 | { | |
96 | unsigned long val = (unsigned long) peer; | |
97 | unsigned long orig = *ptr; | |
98 | ||
7b34ca2a | 99 | if (!(orig & INETPEER_BASE_BIT) || |
97bab73f DM |
100 | cmpxchg(ptr, orig, val) != orig) |
101 | return false; | |
102 | return true; | |
103 | } | |
104 | ||
105 | static inline void inetpeer_init_ptr(unsigned long *ptr, struct inet_peer_base *base) | |
106 | { | |
107 | *ptr = (unsigned long) base | INETPEER_BASE_BIT; | |
108 | } | |
109 | ||
110 | static inline void inetpeer_transfer_peer(unsigned long *to, unsigned long *from) | |
111 | { | |
112 | unsigned long val = *from; | |
113 | ||
114 | *to = val; | |
115 | if (inetpeer_ptr_is_peer(val)) { | |
116 | struct inet_peer *peer = inetpeer_ptr(val); | |
117 | atomic_inc(&peer->refcnt); | |
118 | } | |
119 | } | |
120 | ||
1fd51155 | 121 | void inet_peer_base_init(struct inet_peer_base *); |
c3426b47 | 122 | |
1fd51155 | 123 | void inet_initpeers(void) __init; |
1da177e4 | 124 | |
144001bd DM |
125 | #define INETPEER_METRICS_NEW (~(u32) 0) |
126 | ||
127 | static inline bool inet_metrics_new(const struct inet_peer *p) | |
128 | { | |
129 | return p->metrics[RTAX_LOCK-1] == INETPEER_METRICS_NEW; | |
130 | } | |
131 | ||
1da177e4 | 132 | /* can be called with or without local BH being disabled */ |
c0efc887 | 133 | struct inet_peer *inet_getpeer(struct inet_peer_base *base, |
c8a627ed G |
134 | const struct inetpeer_addr *daddr, |
135 | int create); | |
b534ecf1 | 136 | |
c0efc887 | 137 | static inline struct inet_peer *inet_getpeer_v4(struct inet_peer_base *base, |
54db0cc2 G |
138 | __be32 v4daddr, |
139 | int create) | |
b534ecf1 | 140 | { |
8790ca17 | 141 | struct inetpeer_addr daddr; |
b534ecf1 | 142 | |
7a71ed89 | 143 | daddr.addr.a4 = v4daddr; |
b534ecf1 | 144 | daddr.family = AF_INET; |
c0efc887 | 145 | return inet_getpeer(base, &daddr, create); |
b534ecf1 | 146 | } |
1da177e4 | 147 | |
c0efc887 | 148 | static inline struct inet_peer *inet_getpeer_v6(struct inet_peer_base *base, |
54db0cc2 G |
149 | const struct in6_addr *v6daddr, |
150 | int create) | |
672f007d | 151 | { |
8790ca17 | 152 | struct inetpeer_addr daddr; |
672f007d | 153 | |
4e3fd7a0 | 154 | *(struct in6_addr *)daddr.addr.a6 = *v6daddr; |
672f007d | 155 | daddr.family = AF_INET6; |
c0efc887 | 156 | return inet_getpeer(base, &daddr, create); |
672f007d DM |
157 | } |
158 | ||
1da177e4 | 159 | /* can be called from BH context or outside */ |
1fd51155 JP |
160 | void inet_putpeer(struct inet_peer *p); |
161 | bool inet_peer_xrlim_allow(struct inet_peer *peer, int timeout); | |
1da177e4 | 162 | |
1fd51155 | 163 | void inetpeer_invalidate_tree(struct inet_peer_base *); |
5faa5df1 | 164 | |
317fe0e6 | 165 | /* |
73f156a6 | 166 | * temporary check to make sure we dont access rid, tcp_ts, |
317fe0e6 ED |
167 | * tcp_ts_stamp if no refcount is taken on inet_peer |
168 | */ | |
169 | static inline void inet_peer_refcheck(const struct inet_peer *p) | |
170 | { | |
171 | WARN_ON_ONCE(atomic_read(&p->refcnt) <= 0); | |
172 | } | |
1da177e4 | 173 | #endif /* _NET_INETPEER_H */ |