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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 | ||
18 | #include <linux/config.h> | |
19 | ||
20 | #include <linux/list.h> | |
21 | #include <linux/types.h> | |
22 | ||
23 | #include <net/sock.h> | |
24 | #include <net/tcp_states.h> | |
25 | ||
26 | #include <asm/atomic.h> | |
27 | ||
28 | #if (BITS_PER_LONG == 64) | |
29 | #define INET_TIMEWAIT_ADDRCMP_ALIGN_BYTES 8 | |
30 | #else | |
31 | #define INET_TIMEWAIT_ADDRCMP_ALIGN_BYTES 4 | |
32 | #endif | |
33 | ||
34 | struct inet_bind_bucket; | |
35 | ||
36 | /* | |
37 | * This is a TIME_WAIT sock. It works around the memory consumption | |
38 | * problems of sockets in such a state on heavily loaded servers, but | |
39 | * without violating the protocol specification. | |
40 | */ | |
41 | struct inet_timewait_sock { | |
42 | /* | |
43 | * Now struct sock also uses sock_common, so please just | |
44 | * don't add nothing before this first member (__tw_common) --acme | |
45 | */ | |
46 | struct sock_common __tw_common; | |
47 | #define tw_family __tw_common.skc_family | |
48 | #define tw_state __tw_common.skc_state | |
49 | #define tw_reuse __tw_common.skc_reuse | |
50 | #define tw_bound_dev_if __tw_common.skc_bound_dev_if | |
51 | #define tw_node __tw_common.skc_node | |
52 | #define tw_bind_node __tw_common.skc_bind_node | |
53 | #define tw_refcnt __tw_common.skc_refcnt | |
54 | #define tw_prot __tw_common.skc_prot | |
55 | volatile unsigned char tw_substate; | |
56 | /* 3 bits hole, try to pack */ | |
57 | unsigned char tw_rcv_wscale; | |
58 | /* Socket demultiplex comparisons on incoming packets. */ | |
59 | /* these five are in inet_sock */ | |
60 | __u16 tw_sport; | |
61 | __u32 tw_daddr __attribute__((aligned(INET_TIMEWAIT_ADDRCMP_ALIGN_BYTES))); | |
62 | __u32 tw_rcv_saddr; | |
63 | __u16 tw_dport; | |
64 | __u16 tw_num; | |
65 | /* And these are ours. */ | |
66 | __u8 tw_ipv6only:1; | |
67 | /* 31 bits hole, try to pack */ | |
68 | int tw_hashent; | |
69 | int tw_timeout; | |
70 | unsigned long tw_ttd; | |
71 | struct inet_bind_bucket *tw_tb; | |
72 | struct hlist_node tw_death_node; | |
73 | }; | |
74 | ||
75 | static inline void inet_twsk_add_node(struct inet_timewait_sock *tw, | |
76 | struct hlist_head *list) | |
77 | { | |
78 | hlist_add_head(&tw->tw_node, list); | |
79 | } | |
80 | ||
81 | static inline void inet_twsk_add_bind_node(struct inet_timewait_sock *tw, | |
82 | struct hlist_head *list) | |
83 | { | |
84 | hlist_add_head(&tw->tw_bind_node, list); | |
85 | } | |
86 | ||
87 | static inline int inet_twsk_dead_hashed(const struct inet_timewait_sock *tw) | |
88 | { | |
89 | return tw->tw_death_node.pprev != NULL; | |
90 | } | |
91 | ||
92 | static inline void inet_twsk_dead_node_init(struct inet_timewait_sock *tw) | |
93 | { | |
94 | tw->tw_death_node.pprev = NULL; | |
95 | } | |
96 | ||
97 | static inline void __inet_twsk_del_dead_node(struct inet_timewait_sock *tw) | |
98 | { | |
99 | __hlist_del(&tw->tw_death_node); | |
100 | inet_twsk_dead_node_init(tw); | |
101 | } | |
102 | ||
103 | static inline int inet_twsk_del_dead_node(struct inet_timewait_sock *tw) | |
104 | { | |
105 | if (inet_twsk_dead_hashed(tw)) { | |
106 | __inet_twsk_del_dead_node(tw); | |
107 | return 1; | |
108 | } | |
109 | return 0; | |
110 | } | |
111 | ||
112 | #define inet_twsk_for_each(tw, node, head) \ | |
113 | hlist_for_each_entry(tw, node, head, tw_node) | |
114 | ||
115 | #define inet_twsk_for_each_inmate(tw, node, jail) \ | |
116 | hlist_for_each_entry(tw, node, jail, tw_death_node) | |
117 | ||
118 | #define inet_twsk_for_each_inmate_safe(tw, node, safe, jail) \ | |
119 | hlist_for_each_entry_safe(tw, node, safe, jail, tw_death_node) | |
120 | ||
121 | static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk) | |
122 | { | |
123 | return (struct inet_timewait_sock *)sk; | |
124 | } | |
125 | ||
126 | static inline u32 inet_rcv_saddr(const struct sock *sk) | |
127 | { | |
128 | return likely(sk->sk_state != TCP_TIME_WAIT) ? | |
129 | inet_sk(sk)->rcv_saddr : inet_twsk(sk)->tw_rcv_saddr; | |
130 | } | |
131 | ||
132 | static inline void inet_twsk_put(struct inet_timewait_sock *tw) | |
133 | { | |
134 | if (atomic_dec_and_test(&tw->tw_refcnt)) { | |
135 | #ifdef SOCK_REFCNT_DEBUG | |
136 | printk(KERN_DEBUG "%s timewait_sock %p released\n", | |
137 | tw->tw_prot->name, tw); | |
138 | #endif | |
139 | kmem_cache_free(tw->tw_prot->twsk_slab, tw); | |
140 | } | |
141 | } | |
142 | #endif /* _INET_TIMEWAIT_SOCK_ */ |