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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_tx_queue_mapping __tw_common.skc_tx_queue_mapping
49#define tw_rx_queue_mapping __tw_common.skc_rx_queue_mapping
50#define tw_hash __tw_common.skc_hash
51#define tw_prot __tw_common.skc_prot
52#define tw_net __tw_common.skc_net
53#define tw_daddr __tw_common.skc_daddr
54#define tw_v6_daddr __tw_common.skc_v6_daddr
55#define tw_rcv_saddr __tw_common.skc_rcv_saddr
56#define tw_v6_rcv_saddr __tw_common.skc_v6_rcv_saddr
57#define tw_dport __tw_common.skc_dport
58#define tw_num __tw_common.skc_num
59#define tw_cookie __tw_common.skc_cookie
60#define tw_dr __tw_common.skc_tw_dr
61
62 __u32 tw_mark;
63 unsigned char tw_substate;
64 unsigned char tw_rcv_wscale;
65
66 /* Socket demultiplex comparisons on incoming packets. */
67 /* these three are in inet_sock */
68 __be16 tw_sport;
69 /* And these are ours. */
70 unsigned int tw_transparent : 1,
71 tw_flowlabel : 20,
72 tw_usec_ts : 1,
73 tw_connect_bind : 1,
74 tw_pad : 1, /* 1 bit hole */
75 tw_tos : 8;
76 u32 tw_txhash;
77 u32 tw_priority;
78 /**
79 * @tw_reuse_stamp: Time of entry into %TCP_TIME_WAIT state in msec.
80 */
81 u32 tw_entry_stamp;
82 struct timer_list tw_timer;
83 struct inet_bind_bucket *tw_tb;
84 struct inet_bind2_bucket *tw_tb2;
85#if IS_ENABLED(CONFIG_INET_PSP)
86 struct psp_assoc __rcu *psp_assoc;
87#endif
88#ifdef CONFIG_SOCK_VALIDATE_XMIT
89 struct sk_buff* (*tw_validate_xmit_skb)(struct sock *sk,
90 struct net_device *dev,
91 struct sk_buff *skb);
92#endif
93};
94#define tw_tclass tw_tos
95
96static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk)
97{
98 return (struct inet_timewait_sock *)sk;
99}
100
101void inet_twsk_free(struct inet_timewait_sock *tw);
102void inet_twsk_put(struct inet_timewait_sock *tw);
103
104void inet_twsk_bind_unhash(struct inet_timewait_sock *tw,
105 struct inet_hashinfo *hashinfo);
106
107struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk,
108 struct inet_timewait_death_row *dr,
109 const int state);
110
111void inet_twsk_hashdance_schedule(struct inet_timewait_sock *tw,
112 struct sock *sk,
113 struct inet_hashinfo *hashinfo,
114 int timeo);
115
116void __inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo,
117 bool rearm);
118
119static inline void inet_twsk_reschedule(struct inet_timewait_sock *tw, int timeo)
120{
121 __inet_twsk_schedule(tw, timeo, true);
122}
123
124void inet_twsk_deschedule_put(struct inet_timewait_sock *tw);
125
126void inet_twsk_purge(struct inet_hashinfo *hashinfo);
127
128static inline
129struct net *twsk_net(const struct inet_timewait_sock *twsk)
130{
131 return read_pnet(&twsk->tw_net);
132}
133
134static inline
135void twsk_net_set(struct inet_timewait_sock *twsk, struct net *net)
136{
137 write_pnet(&twsk->tw_net, net);
138}
139#endif /* _INET_TIMEWAIT_SOCK_ */