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
143
144
145
146
147
148
149
150
151
152
153
154
|
/*
* 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/config.h>
#include <linux/ip.h>
#include <linux/list.h>
#include <linux/types.h>
#include <net/sock.h>
#include <net/tcp_states.h>
#include <asm/atomic.h>
#if (BITS_PER_LONG == 64)
#define INET_TIMEWAIT_ADDRCMP_ALIGN_BYTES 8
#else
#define INET_TIMEWAIT_ADDRCMP_ALIGN_BYTES 4
#endif
struct inet_bind_bucket;
struct inet_hashinfo;
/*
* 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_bound_dev_if __tw_common.skc_bound_dev_if
#define tw_node __tw_common.skc_node
#define tw_bind_node __tw_common.skc_bind_node
#define tw_refcnt __tw_common.skc_refcnt
#define tw_prot __tw_common.skc_prot
volatile unsigned char tw_substate;
/* 3 bits hole, try to pack */
unsigned char tw_rcv_wscale;
/* Socket demultiplex comparisons on incoming packets. */
/* these five are in inet_sock */
__u16 tw_sport;
__u32 tw_daddr __attribute__((aligned(INET_TIMEWAIT_ADDRCMP_ALIGN_BYTES)));
__u32 tw_rcv_saddr;
__u16 tw_dport;
__u16 tw_num;
/* And these are ours. */
__u8 tw_ipv6only:1;
/* 31 bits hole, try to pack */
int tw_hashent;
int tw_timeout;
unsigned long tw_ttd;
struct inet_bind_bucket *tw_tb;
struct hlist_node tw_death_node;
};
static inline void inet_twsk_add_node(struct inet_timewait_sock *tw,
struct hlist_head *list)
{
hlist_add_head(&tw->tw_node, list);
}
static inline void inet_twsk_add_bind_node(struct inet_timewait_sock *tw,
struct hlist_head *list)
{
hlist_add_head(&tw->tw_bind_node, list);
}
static inline int inet_twsk_dead_hashed(const struct inet_timewait_sock *tw)
{
return tw->tw_death_node.pprev != NULL;
}
static inline void inet_twsk_dead_node_init(struct inet_timewait_sock *tw)
{
tw->tw_death_node.pprev = NULL;
}
static inline void __inet_twsk_del_dead_node(struct inet_timewait_sock *tw)
{
__hlist_del(&tw->tw_death_node);
inet_twsk_dead_node_init(tw);
}
static inline int inet_twsk_del_dead_node(struct inet_timewait_sock *tw)
{
if (inet_twsk_dead_hashed(tw)) {
__inet_twsk_del_dead_node(tw);
return 1;
}
return 0;
}
#define inet_twsk_for_each(tw, node, head) \
hlist_for_each_entry(tw, node, head, tw_node)
#define inet_twsk_for_each_inmate(tw, node, jail) \
hlist_for_each_entry(tw, node, jail, tw_death_node)
#define inet_twsk_for_each_inmate_safe(tw, node, safe, jail) \
hlist_for_each_entry_safe(tw, node, safe, jail, tw_death_node)
static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk)
{
return (struct inet_timewait_sock *)sk;
}
static inline u32 inet_rcv_saddr(const struct sock *sk)
{
return likely(sk->sk_state != TCP_TIME_WAIT) ?
inet_sk(sk)->rcv_saddr : inet_twsk(sk)->tw_rcv_saddr;
}
static inline void inet_twsk_put(struct inet_timewait_sock *tw)
{
if (atomic_dec_and_test(&tw->tw_refcnt)) {
#ifdef SOCK_REFCNT_DEBUG
printk(KERN_DEBUG "%s timewait_sock %p released\n",
tw->tw_prot->name, tw);
#endif
kmem_cache_free(tw->tw_prot->twsk_slab, tw);
}
}
extern struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk,
const int state);
extern void __inet_twsk_kill(struct inet_timewait_sock *tw,
struct inet_hashinfo *hashinfo);
extern void __inet_twsk_hashdance(struct inet_timewait_sock *tw,
struct sock *sk,
struct inet_hashinfo *hashinfo);
#endif /* _INET_TIMEWAIT_SOCK_ */
|
