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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 | struct inetpeer_addr_base { |
19 | union { |
20 | __be32 a4; |
21 | __be32 a6[4]; |
22 | }; |
23 | }; |
24 | |
25 | struct inetpeer_addr { |
26 | struct inetpeer_addr_base addr; |
27 | __u16 family; |
28 | }; |
29 | |
30 | struct inet_peer { |
31 | /* group together avl_left,avl_right,v4daddr to speedup lookups */ |
32 | struct inet_peer __rcu *avl_left, *avl_right; |
33 | struct inetpeer_addr daddr; |
34 | __u32 avl_height; |
35 | |
36 | u32 metrics[RTAX_MAX]; |
37 | u32 rate_tokens; /* rate limiting for ICMP */ |
38 | unsigned long rate_last; |
39 | union { |
40 | struct list_head gc_list; |
41 | struct rcu_head gc_rcu; |
42 | }; |
43 | /* |
44 | * Once inet_peer is queued for deletion (refcnt == -1), following fields |
45 | * are not available: rid, ip_id_count |
46 | * We can share memory with rcu_head to help keep inet_peer small. |
47 | */ |
48 | union { |
49 | struct { |
50 | atomic_t rid; /* Frag reception counter */ |
51 | atomic_t ip_id_count; /* IP ID for the next packet */ |
52 | }; |
53 | struct rcu_head rcu; |
54 | struct inet_peer *gc_next; |
55 | }; |
56 | |
57 | /* following fields might be frequently dirtied */ |
58 | __u32 dtime; /* the time of last use of not referenced entries */ |
59 | atomic_t refcnt; |
60 | }; |
61 | |
62 | struct inet_peer_base { |
63 | struct inet_peer __rcu *root; |
64 | seqlock_t lock; |
65 | u32 flush_seq; |
66 | int total; |
67 | }; |
68 | |
69 | #define INETPEER_BASE_BIT 0x1UL |
70 | |
71 | static inline struct inet_peer *inetpeer_ptr(unsigned long val) |
72 | { |
73 | BUG_ON(val & INETPEER_BASE_BIT); |
74 | return (struct inet_peer *) val; |
75 | } |
76 | |
77 | static inline struct inet_peer_base *inetpeer_base_ptr(unsigned long val) |
78 | { |
79 | if (!(val & INETPEER_BASE_BIT)) |
80 | return NULL; |
81 | val &= ~INETPEER_BASE_BIT; |
82 | return (struct inet_peer_base *) val; |
83 | } |
84 | |
85 | static inline bool inetpeer_ptr_is_peer(unsigned long val) |
86 | { |
87 | return !(val & INETPEER_BASE_BIT); |
88 | } |
89 | |
90 | static inline void __inetpeer_ptr_set_peer(unsigned long *val, struct inet_peer *peer) |
91 | { |
92 | /* This implicitly clears INETPEER_BASE_BIT */ |
93 | *val = (unsigned long) peer; |
94 | } |
95 | |
96 | static inline bool inetpeer_ptr_set_peer(unsigned long *ptr, struct inet_peer *peer) |
97 | { |
98 | unsigned long val = (unsigned long) peer; |
99 | unsigned long orig = *ptr; |
100 | |
101 | if (!(orig & INETPEER_BASE_BIT) || |
102 | cmpxchg(ptr, orig, val) != orig) |
103 | return false; |
104 | return true; |
105 | } |
106 | |
107 | static inline void inetpeer_init_ptr(unsigned long *ptr, struct inet_peer_base *base) |
108 | { |
109 | *ptr = (unsigned long) base | INETPEER_BASE_BIT; |
110 | } |
111 | |
112 | static inline void inetpeer_transfer_peer(unsigned long *to, unsigned long *from) |
113 | { |
114 | unsigned long val = *from; |
115 | |
116 | *to = val; |
117 | if (inetpeer_ptr_is_peer(val)) { |
118 | struct inet_peer *peer = inetpeer_ptr(val); |
119 | atomic_inc(&peer->refcnt); |
120 | } |
121 | } |
122 | |
123 | void inet_peer_base_init(struct inet_peer_base *); |
124 | |
125 | void inet_initpeers(void) __init; |
126 | |
127 | #define INETPEER_METRICS_NEW (~(u32) 0) |
128 | |
129 | static inline bool inet_metrics_new(const struct inet_peer *p) |
130 | { |
131 | return p->metrics[RTAX_LOCK-1] == INETPEER_METRICS_NEW; |
132 | } |
133 | |
134 | /* can be called with or without local BH being disabled */ |
135 | struct inet_peer *inet_getpeer(struct inet_peer_base *base, |
136 | const struct inetpeer_addr *daddr, |
137 | int create); |
138 | |
139 | static inline struct inet_peer *inet_getpeer_v4(struct inet_peer_base *base, |
140 | __be32 v4daddr, |
141 | int create) |
142 | { |
143 | struct inetpeer_addr daddr; |
144 | |
145 | daddr.addr.a4 = v4daddr; |
146 | daddr.family = AF_INET; |
147 | return inet_getpeer(base, &daddr, create); |
148 | } |
149 | |
150 | static inline struct inet_peer *inet_getpeer_v6(struct inet_peer_base *base, |
151 | const struct in6_addr *v6daddr, |
152 | int create) |
153 | { |
154 | struct inetpeer_addr daddr; |
155 | |
156 | *(struct in6_addr *)daddr.addr.a6 = *v6daddr; |
157 | daddr.family = AF_INET6; |
158 | return inet_getpeer(base, &daddr, create); |
159 | } |
160 | |
161 | /* can be called from BH context or outside */ |
162 | void inet_putpeer(struct inet_peer *p); |
163 | bool inet_peer_xrlim_allow(struct inet_peer *peer, int timeout); |
164 | |
165 | void inetpeer_invalidate_tree(struct inet_peer_base *); |
166 | void inetpeer_invalidate_family(int family); |
167 | |
168 | /* |
169 | * temporary check to make sure we dont access rid, ip_id_count, tcp_ts, |
170 | * tcp_ts_stamp if no refcount is taken on inet_peer |
171 | */ |
172 | static inline void inet_peer_refcheck(const struct inet_peer *p) |
173 | { |
174 | WARN_ON_ONCE(atomic_read(&p->refcnt) <= 0); |
175 | } |
176 | |
177 | |
178 | /* can be called with or without local BH being disabled */ |
179 | static inline int inet_getid(struct inet_peer *p, int more) |
180 | { |
181 | int old, new; |
182 | more++; |
183 | inet_peer_refcheck(p); |
184 | do { |
185 | old = atomic_read(&p->ip_id_count); |
186 | new = old + more; |
187 | if (!new) |
188 | new = 1; |
189 | } while (atomic_cmpxchg(&p->ip_id_count, old, new) != old); |
190 | return new; |
191 | } |
192 | |
193 | #endif /* _NET_INETPEER_H */ |
194 |
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