1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Definitions for a generic INET TIMEWAIT sock
7 *
8 * From code originally in net/tcp.h
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15#ifndef _INET_TIMEWAIT_SOCK_
16#define _INET_TIMEWAIT_SOCK_
17
18#include <linux/list.h>
19#include <linux/timer.h>
20#include <linux/types.h>
21#include <linux/workqueue.h>
22
23#include <net/inet_sock.h>
24#include <net/sock.h>
25#include <net/tcp_states.h>
26#include <net/timewait_sock.h>
27
28#include <linux/atomic.h>
29
30struct inet_bind_bucket;
31
32/*
33 * This is a TIME_WAIT sock. It works around the memory consumption
34 * problems of sockets in such a state on heavily loaded servers, but
35 * without violating the protocol specification.
36 */
37struct inet_timewait_sock {
38 /*
39 * Now struct sock also uses sock_common, so please just
40 * don't add nothing before this first member (__tw_common) --acme
41 */
42 struct sock_common __tw_common;
43#define tw_family __tw_common.skc_family
44#define tw_state __tw_common.skc_state
45#define tw_reuse __tw_common.skc_reuse
46#define tw_reuseport __tw_common.skc_reuseport
47#define tw_ipv6only __tw_common.skc_ipv6only
48#define tw_bound_dev_if __tw_common.skc_bound_dev_if
49#define tw_node __tw_common.skc_nulls_node
50#define tw_bind_node __tw_common.skc_bind_node
51#define tw_refcnt __tw_common.skc_refcnt
52#define tw_hash __tw_common.skc_hash
53#define tw_prot __tw_common.skc_prot
54#define tw_net __tw_common.skc_net
55#define tw_daddr __tw_common.skc_daddr
56#define tw_v6_daddr __tw_common.skc_v6_daddr
57#define tw_rcv_saddr __tw_common.skc_rcv_saddr
58#define tw_v6_rcv_saddr __tw_common.skc_v6_rcv_saddr
59#define tw_dport __tw_common.skc_dport
60#define tw_num __tw_common.skc_num
61#define tw_cookie __tw_common.skc_cookie
62#define tw_dr __tw_common.skc_tw_dr
63
64 __u32 tw_mark;
65 volatile unsigned char tw_substate;
66 unsigned char tw_rcv_wscale;
67
68 /* Socket demultiplex comparisons on incoming packets. */
69 /* these three are in inet_sock */
70 __be16 tw_sport;
71 /* And these are ours. */
72 unsigned int tw_kill : 1,
73 tw_transparent : 1,
74 tw_flowlabel : 20,
75 tw_pad : 2, /* 2 bits hole */
76 tw_tos : 8;
77 struct timer_list tw_timer;
78 struct inet_bind_bucket *tw_tb;
79};
80#define tw_tclass tw_tos
81
82static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk)
83{
84 return (struct inet_timewait_sock *)sk;
85}
86
87void inet_twsk_free(struct inet_timewait_sock *tw);
88void inet_twsk_put(struct inet_timewait_sock *tw);
89
90void inet_twsk_bind_unhash(struct inet_timewait_sock *tw,
91 struct inet_hashinfo *hashinfo);
92
93struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk,
94 struct inet_timewait_death_row *dr,
95 const int state);
96
97void inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk,
98 struct inet_hashinfo *hashinfo);
99
100void __inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo,
101 bool rearm);
102
103static inline void inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo)
104{
105 __inet_twsk_schedule(tw, timeo, false);
106}
107
108static inline void inet_twsk_reschedule(struct inet_timewait_sock *tw, int timeo)
109{
110 __inet_twsk_schedule(tw, timeo, true);
111}
112
113void inet_twsk_deschedule_put(struct inet_timewait_sock *tw);
114
115void inet_twsk_purge(struct inet_hashinfo *hashinfo, int family);
116
117static inline
118struct net *twsk_net(const struct inet_timewait_sock *twsk)
119{
120 return read_pnet(&twsk->tw_net);
121}
122
123static inline
124void twsk_net_set(struct inet_timewait_sock *twsk, struct net *net)
125{
126 write_pnet(&twsk->tw_net, net);
127}
128#endif /* _INET_TIMEWAIT_SOCK_ */
129