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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * INETPEER - A storage for permanent information about peers
3 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 * 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>
David S. Miller60659822011-01-26 20:55:53 -080014#include <linux/rtnetlink.h>
David S. Miller672f0072010-11-30 12:20:00 -080015#include <net/ipv6.h>
Arun Sharma600634972011-07-26 16:09:06 -070016#include <linux/atomic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
David S. Miller7a71ed82011-02-09 14:30:26 -080018struct inetpeer_addr_base {
David S. Miller582a72d2010-11-30 11:53:55 -080019 union {
David S. Miller7a71ed82011-02-09 14:30:26 -080020 __be32 a4;
21 __be32 a6[4];
David S. Miller582a72d2010-11-30 11:53:55 -080022 };
David S. Miller7a71ed82011-02-09 14:30:26 -080023};
24
25struct inetpeer_addr {
26 struct inetpeer_addr_base addr;
27 __u16 family;
David S. Miller8790ca12010-12-01 17:28:18 -080028};
David S. Miller582a72d2010-11-30 11:53:55 -080029
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000030struct inet_peer {
Eric Dumazet78d79422006-10-20 00:28:35 -070031 /* group together avl_left,avl_right,v4daddr to speedup lookups */
Eric Dumazetb914c4e2010-10-25 23:55:38 +000032 struct inet_peer __rcu *avl_left, *avl_right;
David S. Miller8790ca12010-12-01 17:28:18 -080033 struct inetpeer_addr daddr;
Eric Dumazet2c1409a2009-11-12 09:33:09 +000034 __u32 avl_height;
Eric Dumazet2b77bdd2011-06-08 23:31:27 -070035
36 u32 metrics[RTAX_MAX];
37 u32 rate_tokens; /* rate limiting for ICMP */
38 unsigned long rate_last;
Eric Dumazet55432d22012-06-05 03:00:18 +000039 union {
40 struct list_head gc_list;
41 struct rcu_head gc_rcu;
42 };
Eric Dumazet317fe0e2010-06-16 04:52:13 +000043 /*
Eric Dumazet73f156a2014-06-02 05:26:03 -070044 * Once inet_peer is queued for deletion (refcnt == -1), following field
45 * is not available: rid
David S. Miller60659822011-01-26 20:55:53 -080046 * We can share memory with rcu_head to help keep inet_peer small.
Eric Dumazet317fe0e2010-06-16 04:52:13 +000047 */
48 union {
49 struct {
David S. Millerddd4aa42011-02-09 15:36:47 -080050 atomic_t rid; /* Frag reception counter */
Eric Dumazet317fe0e2010-06-16 04:52:13 +000051 };
52 struct rcu_head rcu;
Eric Dumazet4b9d9be2011-06-08 13:35:34 +000053 struct inet_peer *gc_next;
Eric Dumazet317fe0e2010-06-16 04:52:13 +000054 };
Eric Dumazet2b77bdd2011-06-08 23:31:27 -070055
56 /* following fields might be frequently dirtied */
57 __u32 dtime; /* the time of last use of not referenced entries */
58 atomic_t refcnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -070059};
60
David S. Millerc3426b42012-06-09 16:27:05 -070061struct inet_peer_base {
62 struct inet_peer __rcu *root;
63 seqlock_t lock;
64 int total;
65};
66
David S. Miller97bab732012-06-09 22:36:36 -070067#define INETPEER_BASE_BIT 0x1UL
68
69static 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
75static 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
83static inline bool inetpeer_ptr_is_peer(unsigned long val)
84{
85 return !(val & INETPEER_BASE_BIT);
86}
87
88static 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
94static 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
David S. Miller7b34ca22012-06-11 04:13:57 -070099 if (!(orig & INETPEER_BASE_BIT) ||
David S. Miller97bab732012-06-09 22:36:36 -0700100 cmpxchg(ptr, orig, val) != orig)
101 return false;
102 return true;
103}
104
105static inline void inetpeer_init_ptr(unsigned long *ptr, struct inet_peer_base *base)
106{
107 *ptr = (unsigned long) base | INETPEER_BASE_BIT;
108}
109
110static 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
Joe Perches1fd51152013-09-21 10:22:41 -0700121void inet_peer_base_init(struct inet_peer_base *);
David S. Millerc3426b42012-06-09 16:27:05 -0700122
Joe Perches1fd51152013-09-21 10:22:41 -0700123void inet_initpeers(void) __init;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124
David S. Miller144001b2011-01-27 13:52:16 -0800125#define INETPEER_METRICS_NEW (~(u32) 0)
126
127static inline bool inet_metrics_new(const struct inet_peer *p)
128{
129 return p->metrics[RTAX_LOCK-1] == INETPEER_METRICS_NEW;
130}
131
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132/* can be called with or without local BH being disabled */
David S. Millerc0efc882012-06-09 19:12:36 -0700133struct inet_peer *inet_getpeer(struct inet_peer_base *base,
Gao fengc8a627e2012-06-08 01:20:41 +0000134 const struct inetpeer_addr *daddr,
135 int create);
David S. Millerb534ecf2010-11-30 11:54:19 -0800136
David S. Millerc0efc882012-06-09 19:12:36 -0700137static inline struct inet_peer *inet_getpeer_v4(struct inet_peer_base *base,
Gao feng54db0cc2012-06-08 01:21:40 +0000138 __be32 v4daddr,
139 int create)
David S. Millerb534ecf2010-11-30 11:54:19 -0800140{
David S. Miller8790ca12010-12-01 17:28:18 -0800141 struct inetpeer_addr daddr;
David S. Millerb534ecf2010-11-30 11:54:19 -0800142
David S. Miller7a71ed82011-02-09 14:30:26 -0800143 daddr.addr.a4 = v4daddr;
David S. Millerb534ecf2010-11-30 11:54:19 -0800144 daddr.family = AF_INET;
David S. Millerc0efc882012-06-09 19:12:36 -0700145 return inet_getpeer(base, &daddr, create);
David S. Millerb534ecf2010-11-30 11:54:19 -0800146}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
David S. Millerc0efc882012-06-09 19:12:36 -0700148static inline struct inet_peer *inet_getpeer_v6(struct inet_peer_base *base,
Gao feng54db0cc2012-06-08 01:21:40 +0000149 const struct in6_addr *v6daddr,
150 int create)
David S. Miller672f0072010-11-30 12:20:00 -0800151{
David S. Miller8790ca12010-12-01 17:28:18 -0800152 struct inetpeer_addr daddr;
David S. Miller672f0072010-11-30 12:20:00 -0800153
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000154 *(struct in6_addr *)daddr.addr.a6 = *v6daddr;
David S. Miller672f0072010-11-30 12:20:00 -0800155 daddr.family = AF_INET6;
David S. Millerc0efc882012-06-09 19:12:36 -0700156 return inet_getpeer(base, &daddr, create);
David S. Miller672f0072010-11-30 12:20:00 -0800157}
158
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159/* can be called from BH context or outside */
Joe Perches1fd51152013-09-21 10:22:41 -0700160void inet_putpeer(struct inet_peer *p);
161bool inet_peer_xrlim_allow(struct inet_peer *peer, int timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162
Joe Perches1fd51152013-09-21 10:22:41 -0700163void inetpeer_invalidate_tree(struct inet_peer_base *);
Steffen Klassert5faa5df2012-03-06 21:20:26 +0000164
Eric Dumazet317fe0e2010-06-16 04:52:13 +0000165/*
Eric Dumazet73f156a2014-06-02 05:26:03 -0700166 * temporary check to make sure we dont access rid, tcp_ts,
Eric Dumazet317fe0e2010-06-16 04:52:13 +0000167 * tcp_ts_stamp if no refcount is taken on inet_peer
168 */
169static inline void inet_peer_refcheck(const struct inet_peer *p)
170{
171 WARN_ON_ONCE(atomic_read(&p->refcnt) <= 0);
172}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173#endif /* _NET_INETPEER_H */