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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 | |
295ff7ed ACM |
32 | struct inet_hashinfo; |
33 | ||
34 | #define INET_TWDR_RECYCLE_SLOTS_LOG 5 | |
35 | #define INET_TWDR_RECYCLE_SLOTS (1 << INET_TWDR_RECYCLE_SLOTS_LOG) | |
36 | ||
37 | /* | |
38 | * If time > 4sec, it is "slow" path, no recycling is required, | |
39 | * so that we select tick to get range about 4 seconds. | |
40 | */ | |
41 | #if HZ <= 16 || HZ > 4096 | |
42 | # error Unsupported: HZ <= 16 or HZ > 4096 | |
43 | #elif HZ <= 32 | |
44 | # define INET_TWDR_RECYCLE_TICK (5 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG) | |
45 | #elif HZ <= 64 | |
46 | # define INET_TWDR_RECYCLE_TICK (6 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG) | |
47 | #elif HZ <= 128 | |
48 | # define INET_TWDR_RECYCLE_TICK (7 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG) | |
49 | #elif HZ <= 256 | |
50 | # define INET_TWDR_RECYCLE_TICK (8 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG) | |
51 | #elif HZ <= 512 | |
52 | # define INET_TWDR_RECYCLE_TICK (9 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG) | |
53 | #elif HZ <= 1024 | |
54 | # define INET_TWDR_RECYCLE_TICK (10 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG) | |
55 | #elif HZ <= 2048 | |
56 | # define INET_TWDR_RECYCLE_TICK (11 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG) | |
57 | #else | |
58 | # define INET_TWDR_RECYCLE_TICK (12 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG) | |
59 | #endif | |
60 | ||
96f817fe ED |
61 | static inline u32 inet_tw_time_stamp(void) |
62 | { | |
63 | return jiffies; | |
64 | } | |
65 | ||
295ff7ed ACM |
66 | /* TIME_WAIT reaping mechanism. */ |
67 | #define INET_TWDR_TWKILL_SLOTS 8 /* Please keep this a power of 2. */ | |
68 | ||
69 | #define INET_TWDR_TWKILL_QUOTA 100 | |
70 | ||
71 | struct inet_timewait_death_row { | |
72 | /* Short-time timewait calendar */ | |
73 | int twcal_hand; | |
187f5f84 | 74 | unsigned long twcal_jiffie; |
295ff7ed ACM |
75 | struct timer_list twcal_timer; |
76 | struct hlist_head twcal_row[INET_TWDR_RECYCLE_SLOTS]; | |
77 | ||
78 | spinlock_t death_lock; | |
79 | int tw_count; | |
80 | int period; | |
81 | u32 thread_slots; | |
82 | struct work_struct twkill_work; | |
83 | struct timer_list tw_timer; | |
84 | int slot; | |
85 | struct hlist_head cells[INET_TWDR_TWKILL_SLOTS]; | |
86 | struct inet_hashinfo *hashinfo; | |
87 | int sysctl_tw_recycle; | |
88 | int sysctl_max_tw_buckets; | |
89 | }; | |
90 | ||
1fd51155 JP |
91 | void inet_twdr_hangman(unsigned long data); |
92 | void inet_twdr_twkill_work(struct work_struct *work); | |
93 | void inet_twdr_twcal_tick(unsigned long data); | |
696ab2d3 | 94 | |
8feaf0c0 ACM |
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 | |
3ab5aee7 | 112 | #define tw_node __tw_common.skc_nulls_node |
8feaf0c0 ACM |
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 | 116 | #define tw_prot __tw_common.skc_prot |
07feaebf | 117 | #define tw_net __tw_common.skc_net |
68835aba ED |
118 | #define tw_daddr __tw_common.skc_daddr |
119 | #define tw_rcv_saddr __tw_common.skc_rcv_saddr | |
ce43b03e ED |
120 | #define tw_dport __tw_common.skc_dport |
121 | #define tw_num __tw_common.skc_num | |
ce43b03e | 122 | |
ad8bb780 | 123 | int tw_timeout; |
8feaf0c0 | 124 | volatile unsigned char tw_substate; |
8feaf0c0 | 125 | unsigned char tw_rcv_wscale; |
68835aba | 126 | |
8feaf0c0 | 127 | /* Socket demultiplex comparisons on incoming packets. */ |
68835aba | 128 | /* these three are in inet_sock */ |
23f33c2d | 129 | __be16 tw_sport; |
9e337b0f | 130 | kmemcheck_bitfield_begin(flags); |
8feaf0c0 | 131 | /* And these are ours. */ |
abf90cca ED |
132 | unsigned int tw_ipv6only : 1, |
133 | tw_transparent : 1, | |
66b13d99 ED |
134 | tw_pad : 6, /* 6 bits hole */ |
135 | tw_tos : 8, | |
abf90cca | 136 | tw_ipv6_offset : 16; |
9e337b0f | 137 | kmemcheck_bitfield_end(flags); |
96f817fe | 138 | u32 tw_ttd; |
8feaf0c0 ACM |
139 | struct inet_bind_bucket *tw_tb; |
140 | struct hlist_node tw_death_node; | |
141 | }; | |
b903d324 | 142 | #define tw_tclass tw_tos |
8feaf0c0 | 143 | |
3ab5aee7 ED |
144 | static inline void inet_twsk_add_node_rcu(struct inet_timewait_sock *tw, |
145 | struct hlist_nulls_head *list) | |
8feaf0c0 | 146 | { |
3ab5aee7 | 147 | hlist_nulls_add_head_rcu(&tw->tw_node, list); |
8feaf0c0 ACM |
148 | } |
149 | ||
150 | static inline void inet_twsk_add_bind_node(struct inet_timewait_sock *tw, | |
151 | struct hlist_head *list) | |
152 | { | |
153 | hlist_add_head(&tw->tw_bind_node, list); | |
154 | } | |
155 | ||
156 | static inline int inet_twsk_dead_hashed(const struct inet_timewait_sock *tw) | |
157 | { | |
da753bea | 158 | return !hlist_unhashed(&tw->tw_death_node); |
8feaf0c0 ACM |
159 | } |
160 | ||
161 | static inline void inet_twsk_dead_node_init(struct inet_timewait_sock *tw) | |
162 | { | |
163 | tw->tw_death_node.pprev = NULL; | |
164 | } | |
165 | ||
166 | static inline void __inet_twsk_del_dead_node(struct inet_timewait_sock *tw) | |
167 | { | |
168 | __hlist_del(&tw->tw_death_node); | |
169 | inet_twsk_dead_node_init(tw); | |
170 | } | |
171 | ||
172 | static inline int inet_twsk_del_dead_node(struct inet_timewait_sock *tw) | |
173 | { | |
174 | if (inet_twsk_dead_hashed(tw)) { | |
175 | __inet_twsk_del_dead_node(tw); | |
176 | return 1; | |
177 | } | |
178 | return 0; | |
179 | } | |
180 | ||
181 | #define inet_twsk_for_each(tw, node, head) \ | |
3ab5aee7 | 182 | hlist_nulls_for_each_entry(tw, node, head, tw_node) |
8feaf0c0 | 183 | |
b67bfe0d SL |
184 | #define inet_twsk_for_each_inmate(tw, jail) \ |
185 | hlist_for_each_entry(tw, jail, tw_death_node) | |
8feaf0c0 | 186 | |
b67bfe0d SL |
187 | #define inet_twsk_for_each_inmate_safe(tw, safe, jail) \ |
188 | hlist_for_each_entry_safe(tw, safe, jail, tw_death_node) | |
8feaf0c0 ACM |
189 | |
190 | static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk) | |
191 | { | |
192 | return (struct inet_timewait_sock *)sk; | |
193 | } | |
194 | ||
1fd51155 | 195 | void inet_twsk_put(struct inet_timewait_sock *tw); |
e48c414e | 196 | |
1fd51155 | 197 | int inet_twsk_unhash(struct inet_timewait_sock *tw); |
13475a30 | 198 | |
1fd51155 JP |
199 | int inet_twsk_bind_unhash(struct inet_timewait_sock *tw, |
200 | struct inet_hashinfo *hashinfo); | |
3cdaedae | 201 | |
1fd51155 JP |
202 | struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk, |
203 | const int state); | |
c676270b | 204 | |
1fd51155 JP |
205 | void __inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk, |
206 | struct inet_hashinfo *hashinfo); | |
696ab2d3 | 207 | |
1fd51155 JP |
208 | void inet_twsk_schedule(struct inet_timewait_sock *tw, |
209 | struct inet_timewait_death_row *twdr, | |
210 | const int timeo, const int timewait_len); | |
211 | void inet_twsk_deschedule(struct inet_timewait_sock *tw, | |
212 | struct inet_timewait_death_row *twdr); | |
3b1e0a65 | 213 | |
1fd51155 JP |
214 | void inet_twsk_purge(struct inet_hashinfo *hashinfo, |
215 | struct inet_timewait_death_row *twdr, int family); | |
d315492b | 216 | |
3b1e0a65 YH |
217 | static inline |
218 | struct net *twsk_net(const struct inet_timewait_sock *twsk) | |
219 | { | |
f943cbe6 | 220 | return read_pnet(&twsk->tw_net); |
3b1e0a65 YH |
221 | } |
222 | ||
223 | static inline | |
f5aa23fd | 224 | void twsk_net_set(struct inet_timewait_sock *twsk, struct net *net) |
3b1e0a65 | 225 | { |
f943cbe6 | 226 | write_pnet(&twsk->tw_net, net); |
3b1e0a65 | 227 | } |
8feaf0c0 | 228 | #endif /* _INET_TIMEWAIT_SOCK_ */ |