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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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <asm/atomic.h>
17
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;
Pavel Emelyanovd71209d2007-11-12 21:27:28 -080035 struct list_head unused;
Eric Dumazet4663afe2006-10-12 21:21:06 -070036 __u32 dtime; /* the time of last use of not
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 * referenced entries */
38 atomic_t refcnt;
Eric Dumazet317fe0e2010-06-16 04:52:13 +000039 /*
40 * Once inet_peer is queued for deletion (refcnt == -1), following fields
David S. Miller60659822011-01-26 20:55:53 -080041 * are not available: rid, ip_id_count, tcp_ts, tcp_ts_stamp, metrics
42 * We can share memory with rcu_head to help keep inet_peer small.
Eric Dumazet317fe0e2010-06-16 04:52:13 +000043 */
44 union {
45 struct {
David S. Millerddd4aa42011-02-09 15:36:47 -080046 atomic_t rid; /* Frag reception counter */
47 atomic_t ip_id_count; /* IP ID for the next packet */
48 __u32 tcp_ts;
49 __u32 tcp_ts_stamp;
50 u32 metrics[RTAX_MAX];
51 u32 rate_tokens; /* rate limiting for ICMP */
52 unsigned long rate_last;
53 unsigned long pmtu_expires;
54 u32 pmtu_orig;
55 u32 pmtu_learned;
56 struct inetpeer_addr_base redirect_learned;
Eric Dumazet317fe0e2010-06-16 04:52:13 +000057 };
58 struct rcu_head rcu;
59 };
Linus Torvalds1da177e2005-04-16 15:20:36 -070060};
61
62void inet_initpeers(void) __init;
63
David S. Miller144001b2011-01-27 13:52:16 -080064#define INETPEER_METRICS_NEW (~(u32) 0)
65
66static inline bool inet_metrics_new(const struct inet_peer *p)
67{
68 return p->metrics[RTAX_LOCK-1] == INETPEER_METRICS_NEW;
69}
70
Linus Torvalds1da177e2005-04-16 15:20:36 -070071/* can be called with or without local BH being disabled */
David S. Miller8790ca12010-12-01 17:28:18 -080072struct inet_peer *inet_getpeer(struct inetpeer_addr *daddr, int create);
David S. Millerb534ecf2010-11-30 11:54:19 -080073
74static inline struct inet_peer *inet_getpeer_v4(__be32 v4daddr, int create)
75{
David S. Miller8790ca12010-12-01 17:28:18 -080076 struct inetpeer_addr daddr;
David S. Millerb534ecf2010-11-30 11:54:19 -080077
David S. Miller7a71ed82011-02-09 14:30:26 -080078 daddr.addr.a4 = v4daddr;
David S. Millerb534ecf2010-11-30 11:54:19 -080079 daddr.family = AF_INET;
80 return inet_getpeer(&daddr, create);
81}
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
David S. Miller672f0072010-11-30 12:20:00 -080083static inline struct inet_peer *inet_getpeer_v6(struct in6_addr *v6daddr, int create)
84{
David S. Miller8790ca12010-12-01 17:28:18 -080085 struct inetpeer_addr daddr;
David S. Miller672f0072010-11-30 12:20:00 -080086
David S. Miller7a71ed82011-02-09 14:30:26 -080087 ipv6_addr_copy((struct in6_addr *)daddr.addr.a6, v6daddr);
David S. Miller672f0072010-11-30 12:20:00 -080088 daddr.family = AF_INET6;
89 return inet_getpeer(&daddr, create);
90}
91
Linus Torvalds1da177e2005-04-16 15:20:36 -070092/* can be called from BH context or outside */
Eric Dumazet4663afe2006-10-12 21:21:06 -070093extern void inet_putpeer(struct inet_peer *p);
David S. Miller92d86822011-02-04 15:55:25 -080094extern bool inet_peer_xrlim_allow(struct inet_peer *peer, int timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
Eric Dumazet317fe0e2010-06-16 04:52:13 +000096/*
97 * temporary check to make sure we dont access rid, ip_id_count, tcp_ts,
98 * tcp_ts_stamp if no refcount is taken on inet_peer
99 */
100static inline void inet_peer_refcheck(const struct inet_peer *p)
101{
102 WARN_ON_ONCE(atomic_read(&p->refcnt) <= 0);
103}
104
105
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106/* can be called with or without local BH being disabled */
107static inline __u16 inet_getid(struct inet_peer *p, int more)
108{
Eric Dumazet2c1409a2009-11-12 09:33:09 +0000109 more++;
Eric Dumazet317fe0e2010-06-16 04:52:13 +0000110 inet_peer_refcheck(p);
Eric Dumazet2c1409a2009-11-12 09:33:09 +0000111 return atomic_add_return(more, &p->ip_id_count) - more;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112}
113
114#endif /* _NET_INETPEER_H */