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8feaf0c0 ACM |
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 | ||
8feaf0c0 | 18 | |
9e337b0f | 19 | #include <linux/kmemcheck.h> |
8feaf0c0 | 20 | #include <linux/list.h> |
295ff7ed | 21 | #include <linux/timer.h> |
8feaf0c0 | 22 | #include <linux/types.h> |
295ff7ed | 23 | #include <linux/workqueue.h> |
8feaf0c0 | 24 | |
14c85021 | 25 | #include <net/inet_sock.h> |
8feaf0c0 ACM |
26 | #include <net/sock.h> |
27 | #include <net/tcp_states.h> | |
6d6ee43e | 28 | #include <net/timewait_sock.h> |
8feaf0c0 | 29 | |
60063497 | 30 | #include <linux/atomic.h> |
8feaf0c0 | 31 | |
8feaf0c0 ACM |
32 | struct 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 | */ | |
39 | struct 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 | |
9fe516ba | 48 | #define tw_ipv6only __tw_common.skc_ipv6only |
8feaf0c0 | 49 | #define tw_bound_dev_if __tw_common.skc_bound_dev_if |
3ab5aee7 | 50 | #define tw_node __tw_common.skc_nulls_node |
8feaf0c0 ACM |
51 | #define tw_bind_node __tw_common.skc_bind_node |
52 | #define tw_refcnt __tw_common.skc_refcnt | |
81c3d547 | 53 | #define tw_hash __tw_common.skc_hash |
8feaf0c0 | 54 | #define tw_prot __tw_common.skc_prot |
07feaebf | 55 | #define tw_net __tw_common.skc_net |
68835aba | 56 | #define tw_daddr __tw_common.skc_daddr |
efe4208f | 57 | #define tw_v6_daddr __tw_common.skc_v6_daddr |
68835aba | 58 | #define tw_rcv_saddr __tw_common.skc_rcv_saddr |
efe4208f | 59 | #define tw_v6_rcv_saddr __tw_common.skc_v6_rcv_saddr |
ce43b03e ED |
60 | #define tw_dport __tw_common.skc_dport |
61 | #define tw_num __tw_common.skc_num | |
33cf7c90 | 62 | #define tw_cookie __tw_common.skc_cookie |
8e5eb54d | 63 | #define tw_dr __tw_common.skc_tw_dr |
ce43b03e | 64 | |
ad8bb780 | 65 | int tw_timeout; |
8feaf0c0 | 66 | volatile unsigned char tw_substate; |
8feaf0c0 | 67 | unsigned char tw_rcv_wscale; |
68835aba | 68 | |
8feaf0c0 | 69 | /* Socket demultiplex comparisons on incoming packets. */ |
68835aba | 70 | /* these three are in inet_sock */ |
23f33c2d | 71 | __be16 tw_sport; |
9e337b0f | 72 | kmemcheck_bitfield_begin(flags); |
8feaf0c0 | 73 | /* And these are ours. */ |
789f558c | 74 | unsigned int tw_kill : 1, |
abf90cca | 75 | tw_transparent : 1, |
1d13a96c FF |
76 | tw_flowlabel : 20, |
77 | tw_pad : 2, /* 2 bits hole */ | |
78 | tw_tos : 8; | |
9e337b0f | 79 | kmemcheck_bitfield_end(flags); |
789f558c | 80 | struct timer_list tw_timer; |
8feaf0c0 | 81 | struct inet_bind_bucket *tw_tb; |
8feaf0c0 | 82 | }; |
b903d324 | 83 | #define tw_tclass tw_tos |
8feaf0c0 | 84 | |
8feaf0c0 ACM |
85 | static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk) |
86 | { | |
87 | return (struct inet_timewait_sock *)sk; | |
88 | } | |
89 | ||
05dbc7b5 | 90 | void inet_twsk_free(struct inet_timewait_sock *tw); |
1fd51155 | 91 | void inet_twsk_put(struct inet_timewait_sock *tw); |
e48c414e | 92 | |
fc01538f ED |
93 | void inet_twsk_bind_unhash(struct inet_timewait_sock *tw, |
94 | struct inet_hashinfo *hashinfo); | |
3cdaedae | 95 | |
1fd51155 | 96 | struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk, |
789f558c | 97 | struct inet_timewait_death_row *dr, |
1fd51155 | 98 | const int state); |
c676270b | 99 | |
1fd51155 JP |
100 | void __inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk, |
101 | struct inet_hashinfo *hashinfo); | |
696ab2d3 | 102 | |
ed2e9239 ED |
103 | void __inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo, |
104 | bool rearm); | |
105 | ||
8695a144 | 106 | static inline void inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo) |
ed2e9239 ED |
107 | { |
108 | __inet_twsk_schedule(tw, timeo, false); | |
109 | } | |
110 | ||
8695a144 | 111 | static inline void inet_twsk_reschedule(struct inet_timewait_sock *tw, int timeo) |
ed2e9239 ED |
112 | { |
113 | __inet_twsk_schedule(tw, timeo, true); | |
114 | } | |
115 | ||
dbe7faa4 | 116 | void inet_twsk_deschedule_put(struct inet_timewait_sock *tw); |
3b1e0a65 | 117 | |
1946e672 | 118 | void inet_twsk_purge(struct inet_hashinfo *hashinfo, int family); |
d315492b | 119 | |
3b1e0a65 YH |
120 | static inline |
121 | struct net *twsk_net(const struct inet_timewait_sock *twsk) | |
122 | { | |
f943cbe6 | 123 | return read_pnet(&twsk->tw_net); |
3b1e0a65 YH |
124 | } |
125 | ||
126 | static inline | |
f5aa23fd | 127 | void twsk_net_set(struct inet_timewait_sock *twsk, struct net *net) |
3b1e0a65 | 128 | { |
f943cbe6 | 129 | write_pnet(&twsk->tw_net, net); |
3b1e0a65 | 130 | } |
8feaf0c0 | 131 | #endif /* _INET_TIMEWAIT_SOCK_ */ |