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
26 struct 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 */
33 struct 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_pad : 2, /* 2 bits hole */
74 tw_tos : 8;
75 u32 tw_txhash;
76 u32 tw_priority;
77 /**
78 * @tw_reuse_stamp: Time of entry into %TCP_TIME_WAIT state in msec.
79 */
80 u32 tw_entry_stamp;
81 struct timer_list tw_timer;
82 struct inet_bind_bucket *tw_tb;
83 struct inet_bind2_bucket *tw_tb2;
84 };
85 #define tw_tclass tw_tos
86
inet_twsk(const struct sock * sk)87 static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk)
88 {
89 return (struct inet_timewait_sock *)sk;
90 }
91
92 void inet_twsk_free(struct inet_timewait_sock *tw);
93 void inet_twsk_put(struct inet_timewait_sock *tw);
94
95 void inet_twsk_bind_unhash(struct inet_timewait_sock *tw,
96 struct inet_hashinfo *hashinfo);
97
98 struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk,
99 struct inet_timewait_death_row *dr,
100 const int state);
101
102 void inet_twsk_hashdance_schedule(struct inet_timewait_sock *tw,
103 struct sock *sk,
104 struct inet_hashinfo *hashinfo,
105 int timeo);
106
107 void __inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo,
108 bool rearm);
109
inet_twsk_reschedule(struct inet_timewait_sock * tw,int timeo)110 static inline void inet_twsk_reschedule(struct inet_timewait_sock *tw, int timeo)
111 {
112 __inet_twsk_schedule(tw, timeo, true);
113 }
114
115 void inet_twsk_deschedule_put(struct inet_timewait_sock *tw);
116
117 void inet_twsk_purge(struct inet_hashinfo *hashinfo);
118
119 static inline
twsk_net(const struct inet_timewait_sock * twsk)120 struct net *twsk_net(const struct inet_timewait_sock *twsk)
121 {
122 return read_pnet(&twsk->tw_net);
123 }
124
125 static inline
twsk_net_set(struct inet_timewait_sock * twsk,struct net * net)126 void twsk_net_set(struct inet_timewait_sock *twsk, struct net *net)
127 {
128 write_pnet(&twsk->tw_net, net);
129 }
130 #endif /* _INET_TIMEWAIT_SOCK_ */
131