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 | #include <linux/list.h> |
19 | #include <linux/timer.h> |
20 | #include <linux/types.h> |
21 | #include <linux/workqueue.h> |
22 | |
23 | #include <net/inet_sock.h> |
24 | #include <net/sock.h> |
25 | #include <net/tcp_states.h> |
26 | #include <net/timewait_sock.h> |
27 | |
28 | #include <linux/atomic.h> |
29 | |
30 | struct inet_bind_bucket; |
31 | |
32 | /* |
33 | * This is a TIME_WAIT sock. It works around the memory consumption |
34 | * problems of sockets in such a state on heavily loaded servers, but |
35 | * without violating the protocol specification. |
36 | */ |
37 | struct inet_timewait_sock { |
38 | /* |
39 | * Now struct sock also uses sock_common, so please just |
40 | * don't add nothing before this first member (__tw_common) --acme |
41 | */ |
42 | struct sock_common __tw_common; |
43 | #define tw_family __tw_common.skc_family |
44 | #define tw_state __tw_common.skc_state |
45 | #define tw_reuse __tw_common.skc_reuse |
46 | #define tw_reuseport __tw_common.skc_reuseport |
47 | #define tw_ipv6only __tw_common.skc_ipv6only |
48 | #define tw_bound_dev_if __tw_common.skc_bound_dev_if |
49 | #define tw_node __tw_common.skc_nulls_node |
50 | #define tw_bind_node __tw_common.skc_bind_node |
51 | #define tw_refcnt __tw_common.skc_refcnt |
52 | #define tw_hash __tw_common.skc_hash |
53 | #define tw_prot __tw_common.skc_prot |
54 | #define tw_net __tw_common.skc_net |
55 | #define tw_daddr __tw_common.skc_daddr |
56 | #define tw_v6_daddr __tw_common.skc_v6_daddr |
57 | #define tw_rcv_saddr __tw_common.skc_rcv_saddr |
58 | #define tw_v6_rcv_saddr __tw_common.skc_v6_rcv_saddr |
59 | #define tw_dport __tw_common.skc_dport |
60 | #define tw_num __tw_common.skc_num |
61 | #define tw_cookie __tw_common.skc_cookie |
62 | #define tw_dr __tw_common.skc_tw_dr |
63 | |
64 | __u32 tw_mark; |
65 | volatile unsigned char tw_substate; |
66 | unsigned char tw_rcv_wscale; |
67 | |
68 | /* Socket demultiplex comparisons on incoming packets. */ |
69 | /* these three are in inet_sock */ |
70 | __be16 tw_sport; |
71 | /* And these are ours. */ |
72 | unsigned int tw_kill : 1, |
73 | tw_transparent : 1, |
74 | tw_flowlabel : 20, |
75 | tw_pad : 2, /* 2 bits hole */ |
76 | tw_tos : 8; |
77 | struct timer_list tw_timer; |
78 | struct inet_bind_bucket *tw_tb; |
79 | }; |
80 | #define tw_tclass tw_tos |
81 | |
82 | static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk) |
83 | { |
84 | return (struct inet_timewait_sock *)sk; |
85 | } |
86 | |
87 | void inet_twsk_free(struct inet_timewait_sock *tw); |
88 | void inet_twsk_put(struct inet_timewait_sock *tw); |
89 | |
90 | void inet_twsk_bind_unhash(struct inet_timewait_sock *tw, |
91 | struct inet_hashinfo *hashinfo); |
92 | |
93 | struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk, |
94 | struct inet_timewait_death_row *dr, |
95 | const int state); |
96 | |
97 | void inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk, |
98 | struct inet_hashinfo *hashinfo); |
99 | |
100 | void __inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo, |
101 | bool rearm); |
102 | |
103 | static inline void inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo) |
104 | { |
105 | __inet_twsk_schedule(tw, timeo, false); |
106 | } |
107 | |
108 | static inline void inet_twsk_reschedule(struct inet_timewait_sock *tw, int timeo) |
109 | { |
110 | __inet_twsk_schedule(tw, timeo, true); |
111 | } |
112 | |
113 | void inet_twsk_deschedule_put(struct inet_timewait_sock *tw); |
114 | |
115 | void inet_twsk_purge(struct inet_hashinfo *hashinfo, int family); |
116 | |
117 | static inline |
118 | struct net *twsk_net(const struct inet_timewait_sock *twsk) |
119 | { |
120 | return read_pnet(&twsk->tw_net); |
121 | } |
122 | |
123 | static inline |
124 | void twsk_net_set(struct inet_timewait_sock *twsk, struct net *net) |
125 | { |
126 | write_pnet(&twsk->tw_net, net); |
127 | } |
128 | #endif /* _INET_TIMEWAIT_SOCK_ */ |
129 | |