tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
19#include <linux/kmemcheck.h>
20#include <linux/list.h>
21#include <linux/timer.h>
22#include <linux/types.h>
23#include <linux/workqueue.h>
24
25#include <net/inet_sock.h>
26#include <net/sock.h>
27#include <net/tcp_states.h>
28#include <net/timewait_sock.h>
29
30#include <linux/atomic.h>
31
32struct inet_bind_bucket;
33
34/*
35 * This is a TIME_WAIT sock. It works around the memory consumption
36 * problems of sockets in such a state on heavily loaded servers, but
37 * without violating the protocol specification.
38 */
39struct inet_timewait_sock {
40 /*
41 * Now struct sock also uses sock_common, so please just
42 * don't add nothing before this first member (__tw_common) --acme
43 */
44 struct sock_common __tw_common;
45#define tw_family __tw_common.skc_family
46#define tw_state __tw_common.skc_state
47#define tw_reuse __tw_common.skc_reuse
48#define tw_ipv6only __tw_common.skc_ipv6only
49#define tw_bound_dev_if __tw_common.skc_bound_dev_if
50#define tw_node __tw_common.skc_nulls_node
51#define tw_bind_node __tw_common.skc_bind_node
52#define tw_refcnt __tw_common.skc_refcnt
53#define tw_hash __tw_common.skc_hash
54#define tw_prot __tw_common.skc_prot
55#define tw_net __tw_common.skc_net
56#define tw_daddr __tw_common.skc_daddr
57#define tw_v6_daddr __tw_common.skc_v6_daddr
58#define tw_rcv_saddr __tw_common.skc_rcv_saddr
59#define tw_v6_rcv_saddr __tw_common.skc_v6_rcv_saddr
60#define tw_dport __tw_common.skc_dport
61#define tw_num __tw_common.skc_num
62#define tw_cookie __tw_common.skc_cookie
63#define tw_dr __tw_common.skc_tw_dr
64
65 int tw_timeout;
66 volatile unsigned char tw_substate;
67 unsigned char tw_rcv_wscale;
68
69 /* Socket demultiplex comparisons on incoming packets. */
70 /* these three are in inet_sock */
71 __be16 tw_sport;
72 kmemcheck_bitfield_begin(flags);
73 /* And these are ours. */
74 unsigned int tw_kill : 1,
75 tw_transparent : 1,
76 tw_flowlabel : 20,
77 tw_pad : 2, /* 2 bits hole */
78 tw_tos : 8;
79 kmemcheck_bitfield_end(flags);
80 struct timer_list tw_timer;
81 struct inet_bind_bucket *tw_tb;
82};
83#define tw_tclass tw_tos
84
85static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk)
86{
87 return (struct inet_timewait_sock *)sk;
88}
89
90void inet_twsk_free(struct inet_timewait_sock *tw);
91void inet_twsk_put(struct inet_timewait_sock *tw);
92
93void inet_twsk_bind_unhash(struct inet_timewait_sock *tw,
94 struct inet_hashinfo *hashinfo);
95
96struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk,
97 struct inet_timewait_death_row *dr,
98 const int state);
99
100void __inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk,
101 struct inet_hashinfo *hashinfo);
102
103void __inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo,
104 bool rearm);
105
106static inline void inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo)
107{
108 __inet_twsk_schedule(tw, timeo, false);
109}
110
111static inline void inet_twsk_reschedule(struct inet_timewait_sock *tw, int timeo)
112{
113 __inet_twsk_schedule(tw, timeo, true);
114}
115
116void inet_twsk_deschedule_put(struct inet_timewait_sock *tw);
117
118void inet_twsk_purge(struct inet_hashinfo *hashinfo, int family);
119
120static inline
121struct net *twsk_net(const struct inet_timewait_sock *twsk)
122{
123 return read_pnet(&twsk->tw_net);
124}
125
126static inline
127void twsk_net_set(struct inet_timewait_sock *twsk, struct net *net)
128{
129 write_pnet(&twsk->tw_net, net);
130}
131#endif /* _INET_TIMEWAIT_SOCK_ */