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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 | ||
e48c414e | 20 | #include <linux/ip.h> |
8feaf0c0 | 21 | #include <linux/list.h> |
295ff7ed | 22 | #include <linux/timer.h> |
8feaf0c0 | 23 | #include <linux/types.h> |
295ff7ed | 24 | #include <linux/workqueue.h> |
8feaf0c0 ACM |
25 | |
26 | #include <net/sock.h> | |
27 | #include <net/tcp_states.h> | |
28 | ||
29 | #include <asm/atomic.h> | |
30 | ||
295ff7ed ACM |
31 | struct inet_hashinfo; |
32 | ||
33 | #define INET_TWDR_RECYCLE_SLOTS_LOG 5 | |
34 | #define INET_TWDR_RECYCLE_SLOTS (1 << INET_TWDR_RECYCLE_SLOTS_LOG) | |
35 | ||
36 | /* | |
37 | * If time > 4sec, it is "slow" path, no recycling is required, | |
38 | * so that we select tick to get range about 4 seconds. | |
39 | */ | |
40 | #if HZ <= 16 || HZ > 4096 | |
41 | # error Unsupported: HZ <= 16 or HZ > 4096 | |
42 | #elif HZ <= 32 | |
43 | # define INET_TWDR_RECYCLE_TICK (5 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG) | |
44 | #elif HZ <= 64 | |
45 | # define INET_TWDR_RECYCLE_TICK (6 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG) | |
46 | #elif HZ <= 128 | |
47 | # define INET_TWDR_RECYCLE_TICK (7 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG) | |
48 | #elif HZ <= 256 | |
49 | # define INET_TWDR_RECYCLE_TICK (8 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG) | |
50 | #elif HZ <= 512 | |
51 | # define INET_TWDR_RECYCLE_TICK (9 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG) | |
52 | #elif HZ <= 1024 | |
53 | # define INET_TWDR_RECYCLE_TICK (10 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG) | |
54 | #elif HZ <= 2048 | |
55 | # define INET_TWDR_RECYCLE_TICK (11 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG) | |
56 | #else | |
57 | # define INET_TWDR_RECYCLE_TICK (12 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG) | |
58 | #endif | |
59 | ||
60 | /* TIME_WAIT reaping mechanism. */ | |
61 | #define INET_TWDR_TWKILL_SLOTS 8 /* Please keep this a power of 2. */ | |
62 | ||
63 | #define INET_TWDR_TWKILL_QUOTA 100 | |
64 | ||
65 | struct inet_timewait_death_row { | |
66 | /* Short-time timewait calendar */ | |
67 | int twcal_hand; | |
68 | int twcal_jiffie; | |
69 | struct timer_list twcal_timer; | |
70 | struct hlist_head twcal_row[INET_TWDR_RECYCLE_SLOTS]; | |
71 | ||
72 | spinlock_t death_lock; | |
73 | int tw_count; | |
74 | int period; | |
75 | u32 thread_slots; | |
76 | struct work_struct twkill_work; | |
77 | struct timer_list tw_timer; | |
78 | int slot; | |
79 | struct hlist_head cells[INET_TWDR_TWKILL_SLOTS]; | |
80 | struct inet_hashinfo *hashinfo; | |
81 | int sysctl_tw_recycle; | |
82 | int sysctl_max_tw_buckets; | |
83 | }; | |
84 | ||
696ab2d3 ACM |
85 | extern void inet_twdr_hangman(unsigned long data); |
86 | extern void inet_twdr_twkill_work(void *data); | |
87 | extern void inet_twdr_twcal_tick(unsigned long data); | |
88 | ||
8feaf0c0 ACM |
89 | #if (BITS_PER_LONG == 64) |
90 | #define INET_TIMEWAIT_ADDRCMP_ALIGN_BYTES 8 | |
91 | #else | |
92 | #define INET_TIMEWAIT_ADDRCMP_ALIGN_BYTES 4 | |
93 | #endif | |
94 | ||
95 | struct inet_bind_bucket; | |
96 | ||
97 | /* | |
98 | * This is a TIME_WAIT sock. It works around the memory consumption | |
99 | * problems of sockets in such a state on heavily loaded servers, but | |
100 | * without violating the protocol specification. | |
101 | */ | |
102 | struct inet_timewait_sock { | |
103 | /* | |
104 | * Now struct sock also uses sock_common, so please just | |
105 | * don't add nothing before this first member (__tw_common) --acme | |
106 | */ | |
107 | struct sock_common __tw_common; | |
108 | #define tw_family __tw_common.skc_family | |
109 | #define tw_state __tw_common.skc_state | |
110 | #define tw_reuse __tw_common.skc_reuse | |
111 | #define tw_bound_dev_if __tw_common.skc_bound_dev_if | |
112 | #define tw_node __tw_common.skc_node | |
113 | #define tw_bind_node __tw_common.skc_bind_node | |
114 | #define tw_refcnt __tw_common.skc_refcnt | |
81c3d547 | 115 | #define tw_hash __tw_common.skc_hash |
8feaf0c0 ACM |
116 | #define tw_prot __tw_common.skc_prot |
117 | volatile unsigned char tw_substate; | |
118 | /* 3 bits hole, try to pack */ | |
119 | unsigned char tw_rcv_wscale; | |
120 | /* Socket demultiplex comparisons on incoming packets. */ | |
121 | /* these five are in inet_sock */ | |
122 | __u16 tw_sport; | |
123 | __u32 tw_daddr __attribute__((aligned(INET_TIMEWAIT_ADDRCMP_ALIGN_BYTES))); | |
124 | __u32 tw_rcv_saddr; | |
125 | __u16 tw_dport; | |
126 | __u16 tw_num; | |
127 | /* And these are ours. */ | |
128 | __u8 tw_ipv6only:1; | |
129 | /* 31 bits hole, try to pack */ | |
8feaf0c0 ACM |
130 | int tw_timeout; |
131 | unsigned long tw_ttd; | |
132 | struct inet_bind_bucket *tw_tb; | |
133 | struct hlist_node tw_death_node; | |
134 | }; | |
135 | ||
136 | static inline void inet_twsk_add_node(struct inet_timewait_sock *tw, | |
137 | struct hlist_head *list) | |
138 | { | |
139 | hlist_add_head(&tw->tw_node, list); | |
140 | } | |
141 | ||
142 | static inline void inet_twsk_add_bind_node(struct inet_timewait_sock *tw, | |
143 | struct hlist_head *list) | |
144 | { | |
145 | hlist_add_head(&tw->tw_bind_node, list); | |
146 | } | |
147 | ||
148 | static inline int inet_twsk_dead_hashed(const struct inet_timewait_sock *tw) | |
149 | { | |
150 | return tw->tw_death_node.pprev != NULL; | |
151 | } | |
152 | ||
153 | static inline void inet_twsk_dead_node_init(struct inet_timewait_sock *tw) | |
154 | { | |
155 | tw->tw_death_node.pprev = NULL; | |
156 | } | |
157 | ||
158 | static inline void __inet_twsk_del_dead_node(struct inet_timewait_sock *tw) | |
159 | { | |
160 | __hlist_del(&tw->tw_death_node); | |
161 | inet_twsk_dead_node_init(tw); | |
162 | } | |
163 | ||
164 | static inline int inet_twsk_del_dead_node(struct inet_timewait_sock *tw) | |
165 | { | |
166 | if (inet_twsk_dead_hashed(tw)) { | |
167 | __inet_twsk_del_dead_node(tw); | |
168 | return 1; | |
169 | } | |
170 | return 0; | |
171 | } | |
172 | ||
173 | #define inet_twsk_for_each(tw, node, head) \ | |
174 | hlist_for_each_entry(tw, node, head, tw_node) | |
175 | ||
176 | #define inet_twsk_for_each_inmate(tw, node, jail) \ | |
177 | hlist_for_each_entry(tw, node, jail, tw_death_node) | |
178 | ||
179 | #define inet_twsk_for_each_inmate_safe(tw, node, safe, jail) \ | |
180 | hlist_for_each_entry_safe(tw, node, safe, jail, tw_death_node) | |
181 | ||
182 | static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk) | |
183 | { | |
184 | return (struct inet_timewait_sock *)sk; | |
185 | } | |
186 | ||
187 | static inline u32 inet_rcv_saddr(const struct sock *sk) | |
188 | { | |
189 | return likely(sk->sk_state != TCP_TIME_WAIT) ? | |
190 | inet_sk(sk)->rcv_saddr : inet_twsk(sk)->tw_rcv_saddr; | |
191 | } | |
192 | ||
193 | static inline void inet_twsk_put(struct inet_timewait_sock *tw) | |
194 | { | |
195 | if (atomic_dec_and_test(&tw->tw_refcnt)) { | |
196 | #ifdef SOCK_REFCNT_DEBUG | |
197 | printk(KERN_DEBUG "%s timewait_sock %p released\n", | |
198 | tw->tw_prot->name, tw); | |
199 | #endif | |
200 | kmem_cache_free(tw->tw_prot->twsk_slab, tw); | |
201 | } | |
202 | } | |
e48c414e | 203 | |
c676270b ACM |
204 | extern struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk, |
205 | const int state); | |
206 | ||
e48c414e ACM |
207 | extern void __inet_twsk_kill(struct inet_timewait_sock *tw, |
208 | struct inet_hashinfo *hashinfo); | |
209 | ||
210 | extern void __inet_twsk_hashdance(struct inet_timewait_sock *tw, | |
211 | struct sock *sk, | |
212 | struct inet_hashinfo *hashinfo); | |
696ab2d3 ACM |
213 | |
214 | extern void inet_twsk_schedule(struct inet_timewait_sock *tw, | |
215 | struct inet_timewait_death_row *twdr, | |
216 | const int timeo, const int timewait_len); | |
217 | extern void inet_twsk_deschedule(struct inet_timewait_sock *tw, | |
218 | struct inet_timewait_death_row *twdr); | |
8feaf0c0 | 219 | #endif /* _INET_TIMEWAIT_SOCK_ */ |