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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
32 struct inet_hashinfo;
33
34 struct 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
42 struct 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 */
49 struct 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
95 static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk)
96 {
97 return (struct inet_timewait_sock *)sk;
98 }
99
100 void inet_twsk_free(struct inet_timewait_sock *tw);
101 void inet_twsk_put(struct inet_timewait_sock *tw);
102
103 void inet_twsk_bind_unhash(struct inet_timewait_sock *tw,
104 struct inet_hashinfo *hashinfo);
105
106 struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk,
107 struct inet_timewait_death_row *dr,
108 const int state);
109
110 void __inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk,
111 struct inet_hashinfo *hashinfo);
112
113 void __inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo,
114 bool rearm);
115
116 static inline void inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo)
117 {
118 __inet_twsk_schedule(tw, timeo, false);
119 }
120
121 static inline void inet_twsk_reschedule(struct inet_timewait_sock *tw, int timeo)
122 {
123 __inet_twsk_schedule(tw, timeo, true);
124 }
125
126 void inet_twsk_deschedule_put(struct inet_timewait_sock *tw);
127
128 void inet_twsk_purge(struct inet_hashinfo *hashinfo,
129 struct inet_timewait_death_row *twdr, int family);
130
131 static inline
132 struct net *twsk_net(const struct inet_timewait_sock *twsk)
133 {
134 return read_pnet(&twsk->tw_net);
135 }
136
137 static inline
138 void 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_ */