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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_hashinfo;
33
34struct inet_timewait_death_row {
35 atomic_t tw_count;
36
37 struct inet_hashinfo *hashinfo ____cacheline_aligned_in_smp;
38 int sysctl_tw_recycle;
39 int sysctl_max_tw_buckets;
40};
41
42struct inet_bind_bucket;
43
44/*
45 * This is a TIME_WAIT sock. It works around the memory consumption
46 * problems of sockets in such a state on heavily loaded servers, but
47 * without violating the protocol specification.
48 */
49struct inet_timewait_sock {
50 /*
51 * Now struct sock also uses sock_common, so please just
52 * don't add nothing before this first member (__tw_common) --acme
53 */
54 struct sock_common __tw_common;
55#define tw_family __tw_common.skc_family
56#define tw_state __tw_common.skc_state
57#define tw_reuse __tw_common.skc_reuse
58#define tw_ipv6only __tw_common.skc_ipv6only
59#define tw_bound_dev_if __tw_common.skc_bound_dev_if
60#define tw_node __tw_common.skc_nulls_node
61#define tw_bind_node __tw_common.skc_bind_node
62#define tw_refcnt __tw_common.skc_refcnt
63#define tw_hash __tw_common.skc_hash
64#define tw_prot __tw_common.skc_prot
65#define tw_net __tw_common.skc_net
66#define tw_daddr __tw_common.skc_daddr
67#define tw_v6_daddr __tw_common.skc_v6_daddr
68#define tw_rcv_saddr __tw_common.skc_rcv_saddr
69#define tw_v6_rcv_saddr __tw_common.skc_v6_rcv_saddr
70#define tw_dport __tw_common.skc_dport
71#define tw_num __tw_common.skc_num
72#define tw_cookie __tw_common.skc_cookie
73#define tw_dr __tw_common.skc_tw_dr
74
75 int tw_timeout;
76 volatile unsigned char tw_substate;
77 unsigned char tw_rcv_wscale;
78
79 /* Socket demultiplex comparisons on incoming packets. */
80 /* these three are in inet_sock */
81 __be16 tw_sport;
82 kmemcheck_bitfield_begin(flags);
83 /* And these are ours. */
84 unsigned int tw_kill : 1,
85 tw_transparent : 1,
86 tw_flowlabel : 20,
87 tw_pad : 2, /* 2 bits hole */
88 tw_tos : 8;
89 kmemcheck_bitfield_end(flags);
90 struct timer_list tw_timer;
91 struct inet_bind_bucket *tw_tb;
92};
93#define tw_tclass tw_tos
94
95static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk)
96{
97 return (struct inet_timewait_sock *)sk;
98}
99
100void inet_twsk_free(struct inet_timewait_sock *tw);
101void inet_twsk_put(struct inet_timewait_sock *tw);
102
103void inet_twsk_bind_unhash(struct inet_timewait_sock *tw,
104 struct inet_hashinfo *hashinfo);
105
106struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk,
107 struct inet_timewait_death_row *dr,
108 const int state);
109
110void __inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk,
111 struct inet_hashinfo *hashinfo);
112
113void __inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo,
114 bool rearm);
115
116static inline void inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo)
117{
118 __inet_twsk_schedule(tw, timeo, false);
119}
120
121static inline void inet_twsk_reschedule(struct inet_timewait_sock *tw, int timeo)
122{
123 __inet_twsk_schedule(tw, timeo, true);
124}
125
126void inet_twsk_deschedule_put(struct inet_timewait_sock *tw);
127
128void inet_twsk_purge(struct inet_hashinfo *hashinfo,
129 struct inet_timewait_death_row *twdr, int family);
130
131static inline
132struct net *twsk_net(const struct inet_timewait_sock *twsk)
133{
134 return read_pnet(&twsk->tw_net);
135}
136
137static inline
138void twsk_net_set(struct inet_timewait_sock *twsk, struct net *net)
139{
140 write_pnet(&twsk->tw_net, net);
141}
142#endif /* _INET_TIMEWAIT_SOCK_ */
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * Definitions for a generic INET TIMEWAIT sock
8 *
9 * From code originally in net/tcp.h
10 */
11#ifndef _INET_TIMEWAIT_SOCK_
12#define _INET_TIMEWAIT_SOCK_
13
14#include <linux/list.h>
15#include <linux/timer.h>
16#include <linux/types.h>
17#include <linux/workqueue.h>
18
19#include <net/inet_sock.h>
20#include <net/sock.h>
21#include <net/tcp_states.h>
22#include <net/timewait_sock.h>
23
24#include <linux/atomic.h>
25
26struct inet_bind_bucket;
27
28/*
29 * This is a TIME_WAIT sock. It works around the memory consumption
30 * problems of sockets in such a state on heavily loaded servers, but
31 * without violating the protocol specification.
32 */
33struct inet_timewait_sock {
34 /*
35 * Now struct sock also uses sock_common, so please just
36 * don't add nothing before this first member (__tw_common) --acme
37 */
38 struct sock_common __tw_common;
39#define tw_family __tw_common.skc_family
40#define tw_state __tw_common.skc_state
41#define tw_reuse __tw_common.skc_reuse
42#define tw_reuseport __tw_common.skc_reuseport
43#define tw_ipv6only __tw_common.skc_ipv6only
44#define tw_bound_dev_if __tw_common.skc_bound_dev_if
45#define tw_node __tw_common.skc_nulls_node
46#define tw_bind_node __tw_common.skc_bind_node
47#define tw_refcnt __tw_common.skc_refcnt
48#define tw_hash __tw_common.skc_hash
49#define tw_prot __tw_common.skc_prot
50#define tw_net __tw_common.skc_net
51#define tw_daddr __tw_common.skc_daddr
52#define tw_v6_daddr __tw_common.skc_v6_daddr
53#define tw_rcv_saddr __tw_common.skc_rcv_saddr
54#define tw_v6_rcv_saddr __tw_common.skc_v6_rcv_saddr
55#define tw_dport __tw_common.skc_dport
56#define tw_num __tw_common.skc_num
57#define tw_cookie __tw_common.skc_cookie
58#define tw_dr __tw_common.skc_tw_dr
59
60 __u32 tw_mark;
61 volatile unsigned char tw_substate;
62 unsigned char tw_rcv_wscale;
63
64 /* Socket demultiplex comparisons on incoming packets. */
65 /* these three are in inet_sock */
66 __be16 tw_sport;
67 /* And these are ours. */
68 unsigned int tw_kill : 1,
69 tw_transparent : 1,
70 tw_flowlabel : 20,
71 tw_pad : 2, /* 2 bits hole */
72 tw_tos : 8;
73 u32 tw_txhash;
74 u32 tw_priority;
75 struct timer_list tw_timer;
76 struct inet_bind_bucket *tw_tb;
77};
78#define tw_tclass tw_tos
79
80static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk)
81{
82 return (struct inet_timewait_sock *)sk;
83}
84
85void inet_twsk_free(struct inet_timewait_sock *tw);
86void inet_twsk_put(struct inet_timewait_sock *tw);
87
88void inet_twsk_bind_unhash(struct inet_timewait_sock *tw,
89 struct inet_hashinfo *hashinfo);
90
91struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk,
92 struct inet_timewait_death_row *dr,
93 const int state);
94
95void inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk,
96 struct inet_hashinfo *hashinfo);
97
98void __inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo,
99 bool rearm);
100
101static inline void inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo)
102{
103 __inet_twsk_schedule(tw, timeo, false);
104}
105
106static inline void inet_twsk_reschedule(struct inet_timewait_sock *tw, int timeo)
107{
108 __inet_twsk_schedule(tw, timeo, true);
109}
110
111void inet_twsk_deschedule_put(struct inet_timewait_sock *tw);
112
113void inet_twsk_purge(struct inet_hashinfo *hashinfo, int family);
114
115static inline
116struct net *twsk_net(const struct inet_timewait_sock *twsk)
117{
118 return read_pnet(&twsk->tw_net);
119}
120
121static inline
122void twsk_net_set(struct inet_timewait_sock *twsk, struct net *net)
123{
124 write_pnet(&twsk->tw_net, net);
125}
126#endif /* _INET_TIMEWAIT_SOCK_ */