Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * INETPEER - A storage for permanent information about peers |
| 3 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
David S. Miller | 6065982 | 2011-01-26 20:55:53 -0800 | [diff] [blame] | 14 | #include <linux/rtnetlink.h> |
David S. Miller | 672f007 | 2010-11-30 12:20:00 -0800 | [diff] [blame] | 15 | #include <net/ipv6.h> |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 16 | #include <linux/atomic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | |
David Ahern | 5345c2e | 2015-08-27 16:07:02 -0700 | [diff] [blame^] | 18 | #define INETPEER_MAXKEYSZ (sizeof(struct in6_addr) / sizeof(u32)) |
David S. Miller | 7a71ed8 | 2011-02-09 14:30:26 -0800 | [diff] [blame] | 19 | |
| 20 | struct inetpeer_addr { |
David Ahern | 5345c2e | 2015-08-27 16:07:02 -0700 | [diff] [blame^] | 21 | union { |
| 22 | __be32 a4; |
| 23 | struct in6_addr a6; |
| 24 | u32 key[INETPEER_MAXKEYSZ]; |
| 25 | }; |
David S. Miller | 7a71ed8 | 2011-02-09 14:30:26 -0800 | [diff] [blame] | 26 | __u16 family; |
David S. Miller | 8790ca1 | 2010-12-01 17:28:18 -0800 | [diff] [blame] | 27 | }; |
David S. Miller | 582a72d | 2010-11-30 11:53:55 -0800 | [diff] [blame] | 28 | |
Eric Dumazet | fd2c3ef | 2009-11-03 03:26:03 +0000 | [diff] [blame] | 29 | struct inet_peer { |
Eric Dumazet | 78d7942 | 2006-10-20 00:28:35 -0700 | [diff] [blame] | 30 | /* group together avl_left,avl_right,v4daddr to speedup lookups */ |
Eric Dumazet | b914c4e | 2010-10-25 23:55:38 +0000 | [diff] [blame] | 31 | struct inet_peer __rcu *avl_left, *avl_right; |
David S. Miller | 8790ca1 | 2010-12-01 17:28:18 -0800 | [diff] [blame] | 32 | struct inetpeer_addr daddr; |
Eric Dumazet | 2c1409a | 2009-11-12 09:33:09 +0000 | [diff] [blame] | 33 | __u32 avl_height; |
Eric Dumazet | 2b77bdd | 2011-06-08 23:31:27 -0700 | [diff] [blame] | 34 | |
| 35 | u32 metrics[RTAX_MAX]; |
| 36 | u32 rate_tokens; /* rate limiting for ICMP */ |
| 37 | unsigned long rate_last; |
Eric Dumazet | 55432d2 | 2012-06-05 03:00:18 +0000 | [diff] [blame] | 38 | union { |
| 39 | struct list_head gc_list; |
| 40 | struct rcu_head gc_rcu; |
| 41 | }; |
Eric Dumazet | 317fe0e | 2010-06-16 04:52:13 +0000 | [diff] [blame] | 42 | /* |
Eric Dumazet | 73f156a | 2014-06-02 05:26:03 -0700 | [diff] [blame] | 43 | * Once inet_peer is queued for deletion (refcnt == -1), following field |
| 44 | * is not available: rid |
David S. Miller | 6065982 | 2011-01-26 20:55:53 -0800 | [diff] [blame] | 45 | * We can share memory with rcu_head to help keep inet_peer small. |
Eric Dumazet | 317fe0e | 2010-06-16 04:52:13 +0000 | [diff] [blame] | 46 | */ |
| 47 | union { |
| 48 | struct { |
David S. Miller | ddd4aa4 | 2011-02-09 15:36:47 -0800 | [diff] [blame] | 49 | atomic_t rid; /* Frag reception counter */ |
Eric Dumazet | 317fe0e | 2010-06-16 04:52:13 +0000 | [diff] [blame] | 50 | }; |
| 51 | struct rcu_head rcu; |
Eric Dumazet | 4b9d9be | 2011-06-08 13:35:34 +0000 | [diff] [blame] | 52 | struct inet_peer *gc_next; |
Eric Dumazet | 317fe0e | 2010-06-16 04:52:13 +0000 | [diff] [blame] | 53 | }; |
Eric Dumazet | 2b77bdd | 2011-06-08 23:31:27 -0700 | [diff] [blame] | 54 | |
| 55 | /* following fields might be frequently dirtied */ |
| 56 | __u32 dtime; /* the time of last use of not referenced entries */ |
| 57 | atomic_t refcnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | }; |
| 59 | |
David S. Miller | c3426b4 | 2012-06-09 16:27:05 -0700 | [diff] [blame] | 60 | struct inet_peer_base { |
| 61 | struct inet_peer __rcu *root; |
| 62 | seqlock_t lock; |
| 63 | int total; |
| 64 | }; |
| 65 | |
Joe Perches | 1fd5115 | 2013-09-21 10:22:41 -0700 | [diff] [blame] | 66 | void inet_peer_base_init(struct inet_peer_base *); |
David S. Miller | c3426b4 | 2012-06-09 16:27:05 -0700 | [diff] [blame] | 67 | |
Joe Perches | 1fd5115 | 2013-09-21 10:22:41 -0700 | [diff] [blame] | 68 | void inet_initpeers(void) __init; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | |
David S. Miller | 144001b | 2011-01-27 13:52:16 -0800 | [diff] [blame] | 70 | #define INETPEER_METRICS_NEW (~(u32) 0) |
| 71 | |
David Ahern | 3abef28 | 2015-08-27 16:07:00 -0700 | [diff] [blame] | 72 | static inline void inetpeer_set_addr_v4(struct inetpeer_addr *iaddr, __be32 ip) |
| 73 | { |
David Ahern | 5345c2e | 2015-08-27 16:07:02 -0700 | [diff] [blame^] | 74 | iaddr->a4 = ip; |
David Ahern | 3abef28 | 2015-08-27 16:07:00 -0700 | [diff] [blame] | 75 | iaddr->family = AF_INET; |
| 76 | } |
| 77 | |
| 78 | static inline __be32 inetpeer_get_addr_v4(struct inetpeer_addr *iaddr) |
| 79 | { |
David Ahern | 5345c2e | 2015-08-27 16:07:02 -0700 | [diff] [blame^] | 80 | return iaddr->a4; |
David Ahern | 3abef28 | 2015-08-27 16:07:00 -0700 | [diff] [blame] | 81 | } |
| 82 | |
| 83 | static inline void inetpeer_set_addr_v6(struct inetpeer_addr *iaddr, |
| 84 | struct in6_addr *in6) |
| 85 | { |
David Ahern | 5345c2e | 2015-08-27 16:07:02 -0700 | [diff] [blame^] | 86 | iaddr->a6 = *in6; |
David Ahern | 3abef28 | 2015-08-27 16:07:00 -0700 | [diff] [blame] | 87 | iaddr->family = AF_INET6; |
| 88 | } |
| 89 | |
| 90 | static inline struct in6_addr *inetpeer_get_addr_v6(struct inetpeer_addr *iaddr) |
| 91 | { |
David Ahern | 5345c2e | 2015-08-27 16:07:02 -0700 | [diff] [blame^] | 92 | return &iaddr->a6; |
David Ahern | 3abef28 | 2015-08-27 16:07:00 -0700 | [diff] [blame] | 93 | } |
| 94 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | /* can be called with or without local BH being disabled */ |
David S. Miller | c0efc88 | 2012-06-09 19:12:36 -0700 | [diff] [blame] | 96 | struct inet_peer *inet_getpeer(struct inet_peer_base *base, |
Gao feng | c8a627e | 2012-06-08 01:20:41 +0000 | [diff] [blame] | 97 | const struct inetpeer_addr *daddr, |
| 98 | int create); |
David S. Miller | b534ecf | 2010-11-30 11:54:19 -0800 | [diff] [blame] | 99 | |
David S. Miller | c0efc88 | 2012-06-09 19:12:36 -0700 | [diff] [blame] | 100 | static inline struct inet_peer *inet_getpeer_v4(struct inet_peer_base *base, |
Gao feng | 54db0cc | 2012-06-08 01:21:40 +0000 | [diff] [blame] | 101 | __be32 v4daddr, |
| 102 | int create) |
David S. Miller | b534ecf | 2010-11-30 11:54:19 -0800 | [diff] [blame] | 103 | { |
David S. Miller | 8790ca1 | 2010-12-01 17:28:18 -0800 | [diff] [blame] | 104 | struct inetpeer_addr daddr; |
David S. Miller | b534ecf | 2010-11-30 11:54:19 -0800 | [diff] [blame] | 105 | |
David Ahern | 5345c2e | 2015-08-27 16:07:02 -0700 | [diff] [blame^] | 106 | daddr.a4 = v4daddr; |
David S. Miller | b534ecf | 2010-11-30 11:54:19 -0800 | [diff] [blame] | 107 | daddr.family = AF_INET; |
David S. Miller | c0efc88 | 2012-06-09 19:12:36 -0700 | [diff] [blame] | 108 | return inet_getpeer(base, &daddr, create); |
David S. Miller | b534ecf | 2010-11-30 11:54:19 -0800 | [diff] [blame] | 109 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | |
David S. Miller | c0efc88 | 2012-06-09 19:12:36 -0700 | [diff] [blame] | 111 | static inline struct inet_peer *inet_getpeer_v6(struct inet_peer_base *base, |
Gao feng | 54db0cc | 2012-06-08 01:21:40 +0000 | [diff] [blame] | 112 | const struct in6_addr *v6daddr, |
| 113 | int create) |
David S. Miller | 672f007 | 2010-11-30 12:20:00 -0800 | [diff] [blame] | 114 | { |
David S. Miller | 8790ca1 | 2010-12-01 17:28:18 -0800 | [diff] [blame] | 115 | struct inetpeer_addr daddr; |
David S. Miller | 672f007 | 2010-11-30 12:20:00 -0800 | [diff] [blame] | 116 | |
David Ahern | 5345c2e | 2015-08-27 16:07:02 -0700 | [diff] [blame^] | 117 | daddr.a6 = *v6daddr; |
David S. Miller | 672f007 | 2010-11-30 12:20:00 -0800 | [diff] [blame] | 118 | daddr.family = AF_INET6; |
David S. Miller | c0efc88 | 2012-06-09 19:12:36 -0700 | [diff] [blame] | 119 | return inet_getpeer(base, &daddr, create); |
David S. Miller | 672f007 | 2010-11-30 12:20:00 -0800 | [diff] [blame] | 120 | } |
| 121 | |
David Ahern | d39d14f | 2015-08-27 16:07:01 -0700 | [diff] [blame] | 122 | static inline int inetpeer_addr_cmp(const struct inetpeer_addr *a, |
| 123 | const struct inetpeer_addr *b) |
| 124 | { |
David Ahern | 5345c2e | 2015-08-27 16:07:02 -0700 | [diff] [blame^] | 125 | int i, n; |
| 126 | |
| 127 | if (a->family == AF_INET) |
| 128 | n = sizeof(a->a4) / sizeof(u32); |
| 129 | else |
| 130 | n = sizeof(a->a6) / sizeof(u32); |
David Ahern | d39d14f | 2015-08-27 16:07:01 -0700 | [diff] [blame] | 131 | |
| 132 | for (i = 0; i < n; i++) { |
David Ahern | 5345c2e | 2015-08-27 16:07:02 -0700 | [diff] [blame^] | 133 | if (a->key[i] == b->key[i]) |
David Ahern | d39d14f | 2015-08-27 16:07:01 -0700 | [diff] [blame] | 134 | continue; |
David Ahern | 5345c2e | 2015-08-27 16:07:02 -0700 | [diff] [blame^] | 135 | if (a->key[i] < b->key[i]) |
David Ahern | d39d14f | 2015-08-27 16:07:01 -0700 | [diff] [blame] | 136 | return -1; |
| 137 | return 1; |
| 138 | } |
| 139 | |
| 140 | return 0; |
| 141 | } |
| 142 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | /* can be called from BH context or outside */ |
Joe Perches | 1fd5115 | 2013-09-21 10:22:41 -0700 | [diff] [blame] | 144 | void inet_putpeer(struct inet_peer *p); |
| 145 | bool inet_peer_xrlim_allow(struct inet_peer *peer, int timeout); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | |
Joe Perches | 1fd5115 | 2013-09-21 10:22:41 -0700 | [diff] [blame] | 147 | void inetpeer_invalidate_tree(struct inet_peer_base *); |
Steffen Klassert | 5faa5df | 2012-03-06 21:20:26 +0000 | [diff] [blame] | 148 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | #endif /* _NET_INETPEER_H */ |