summaryrefslogtreecommitdiffstats
path: root/include/net/inet_timewait_sock.h
blob: c9b3eb70f340d48ffe60105622bee367c7ea848f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
/*
 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 *		operating system.  INET is implemented using the  BSD Socket
 *		interface as the means of communication with the user level.
 *
 *		Definitions for a generic INET TIMEWAIT sock
 *
 *		From code originally in net/tcp.h
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 */
#ifndef _INET_TIMEWAIT_SOCK_
#define _INET_TIMEWAIT_SOCK_


#include <linux/kmemcheck.h>
#include <linux/list.h>
#include <linux/timer.h>
#include <linux/types.h>
#include <linux/workqueue.h>

#include <net/inet_sock.h>
#include <net/sock.h>
#include <net/tcp_states.h>
#include <net/timewait_sock.h>

#include <linux/atomic.h>

struct inet_hashinfo;

struct inet_timewait_death_row {
	atomic_t		tw_count;

	struct inet_hashinfo 	*hashinfo ____cacheline_aligned_in_smp;
	int			sysctl_tw_recycle;
	int			sysctl_max_tw_buckets;
};

struct inet_bind_bucket;

/*
 * This is a TIME_WAIT sock. It works around the memory consumption
 * problems of sockets in such a state on heavily loaded servers, but
 * without violating the protocol specification.
 */
struct inet_timewait_sock {
	/*
	 * Now struct sock also uses sock_common, so please just
	 * don't add nothing before this first member (__tw_common) --acme
	 */
	struct sock_common	__tw_common;
#define tw_family		__tw_common.skc_family
#define tw_state		__tw_common.skc_state
#define tw_reuse		__tw_common.skc_reuse
#define tw_ipv6only		__tw_common.skc_ipv6only
#define tw_bound_dev_if		__tw_common.skc_bound_dev_if
#define tw_node			__tw_common.skc_nulls_node
#define tw_bind_node		__tw_common.skc_bind_node
#define tw_refcnt		__tw_common.skc_refcnt
#define tw_hash			__tw_common.skc_hash
#define tw_prot			__tw_common.skc_prot
#define tw_net			__tw_common.skc_net
#define tw_daddr        	__tw_common.skc_daddr
#define tw_v6_daddr		__tw_common.skc_v6_daddr
#define tw_rcv_saddr    	__tw_common.skc_rcv_saddr
#define tw_v6_rcv_saddr    	__tw_common.skc_v6_rcv_saddr
#define tw_dport		__tw_common.skc_dport
#define tw_num			__tw_common.skc_num
#define tw_cookie		__tw_common.skc_cookie
#define tw_dr			__tw_common.skc_tw_dr

	int			tw_timeout;
	volatile unsigned char	tw_substate;
	unsigned char		tw_rcv_wscale;

	/* Socket demultiplex comparisons on incoming packets. */
	/* these three are in inet_sock */
	__be16			tw_sport;
	kmemcheck_bitfield_begin(flags);
	/* And these are ours. */
	unsigned int		tw_kill		: 1,
				tw_transparent  : 1,
				tw_flowlabel	: 20,
				tw_pad		: 2,	/* 2 bits hole */
				tw_tos		: 8;
	kmemcheck_bitfield_end(flags);
	struct timer_list	tw_timer;
	struct inet_bind_bucket	*tw_tb;
};
#define tw_tclass tw_tos

static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk)
{
	return (struct inet_timewait_sock *)sk;
}

void inet_twsk_free(struct inet_timewait_sock *tw);
void inet_twsk_put(struct inet_timewait_sock *tw);

void inet_twsk_bind_unhash(struct inet_timewait_sock *tw,
			   struct inet_hashinfo *hashinfo);

struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk,
					   struct inet_timewait_death_row *dr,
					   const int state);

void __inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk,
			   struct inet_hashinfo *hashinfo);

void __inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo,
			  bool rearm);

static inline void inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo)
{
	__inet_twsk_schedule(tw, timeo, false);
}

static inline void inet_twsk_reschedule(struct inet_timewait_sock *tw, int timeo)
{
	__inet_twsk_schedule(tw, timeo, true);
}

void inet_twsk_deschedule_put(struct inet_timewait_sock *tw);

void inet_twsk_purge(struct inet_hashinfo *hashinfo,
		     struct inet_timewait_death_row *twdr, int family);

static inline
struct net *twsk_net(const struct inet_timewait_sock *twsk)
{
	return read_pnet(&twsk->tw_net);
}

static inline
void twsk_net_set(struct inet_timewait_sock *twsk, struct net *net)
{
	write_pnet(&twsk->tw_net, net);
}
#endif	/* _INET_TIMEWAIT_SOCK_ */