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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> |
eeb2b856 | 21 | #include <linux/module.h> |
295ff7ed | 22 | #include <linux/timer.h> |
8feaf0c0 | 23 | #include <linux/types.h> |
295ff7ed | 24 | #include <linux/workqueue.h> |
8feaf0c0 | 25 | |
14c85021 | 26 | #include <net/inet_sock.h> |
8feaf0c0 ACM |
27 | #include <net/sock.h> |
28 | #include <net/tcp_states.h> | |
6d6ee43e | 29 | #include <net/timewait_sock.h> |
8feaf0c0 | 30 | |
60063497 | 31 | #include <linux/atomic.h> |
8feaf0c0 | 32 | |
295ff7ed ACM |
33 | struct inet_hashinfo; |
34 | ||
35 | #define INET_TWDR_RECYCLE_SLOTS_LOG 5 | |
36 | #define INET_TWDR_RECYCLE_SLOTS (1 << INET_TWDR_RECYCLE_SLOTS_LOG) | |
37 | ||
38 | /* | |
39 | * If time > 4sec, it is "slow" path, no recycling is required, | |
40 | * so that we select tick to get range about 4 seconds. | |
41 | */ | |
42 | #if HZ <= 16 || HZ > 4096 | |
43 | # error Unsupported: HZ <= 16 or HZ > 4096 | |
44 | #elif HZ <= 32 | |
45 | # define INET_TWDR_RECYCLE_TICK (5 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG) | |
46 | #elif HZ <= 64 | |
47 | # define INET_TWDR_RECYCLE_TICK (6 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG) | |
48 | #elif HZ <= 128 | |
49 | # define INET_TWDR_RECYCLE_TICK (7 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG) | |
50 | #elif HZ <= 256 | |
51 | # define INET_TWDR_RECYCLE_TICK (8 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG) | |
52 | #elif HZ <= 512 | |
53 | # define INET_TWDR_RECYCLE_TICK (9 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG) | |
54 | #elif HZ <= 1024 | |
55 | # define INET_TWDR_RECYCLE_TICK (10 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG) | |
56 | #elif HZ <= 2048 | |
57 | # define INET_TWDR_RECYCLE_TICK (11 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG) | |
58 | #else | |
59 | # define INET_TWDR_RECYCLE_TICK (12 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG) | |
60 | #endif | |
61 | ||
62 | /* TIME_WAIT reaping mechanism. */ | |
63 | #define INET_TWDR_TWKILL_SLOTS 8 /* Please keep this a power of 2. */ | |
64 | ||
65 | #define INET_TWDR_TWKILL_QUOTA 100 | |
66 | ||
67 | struct inet_timewait_death_row { | |
68 | /* Short-time timewait calendar */ | |
69 | int twcal_hand; | |
187f5f84 | 70 | unsigned long twcal_jiffie; |
295ff7ed ACM |
71 | struct timer_list twcal_timer; |
72 | struct hlist_head twcal_row[INET_TWDR_RECYCLE_SLOTS]; | |
73 | ||
74 | spinlock_t death_lock; | |
75 | int tw_count; | |
76 | int period; | |
77 | u32 thread_slots; | |
78 | struct work_struct twkill_work; | |
79 | struct timer_list tw_timer; | |
80 | int slot; | |
81 | struct hlist_head cells[INET_TWDR_TWKILL_SLOTS]; | |
82 | struct inet_hashinfo *hashinfo; | |
83 | int sysctl_tw_recycle; | |
84 | int sysctl_max_tw_buckets; | |
85 | }; | |
86 | ||
696ab2d3 | 87 | extern void inet_twdr_hangman(unsigned long data); |
65f27f38 | 88 | extern void inet_twdr_twkill_work(struct work_struct *work); |
696ab2d3 ACM |
89 | extern void inet_twdr_twcal_tick(unsigned long data); |
90 | ||
8feaf0c0 ACM |
91 | struct inet_bind_bucket; |
92 | ||
93 | /* | |
94 | * This is a TIME_WAIT sock. It works around the memory consumption | |
95 | * problems of sockets in such a state on heavily loaded servers, but | |
96 | * without violating the protocol specification. | |
97 | */ | |
98 | struct inet_timewait_sock { | |
99 | /* | |
100 | * Now struct sock also uses sock_common, so please just | |
101 | * don't add nothing before this first member (__tw_common) --acme | |
102 | */ | |
103 | struct sock_common __tw_common; | |
104 | #define tw_family __tw_common.skc_family | |
105 | #define tw_state __tw_common.skc_state | |
106 | #define tw_reuse __tw_common.skc_reuse | |
107 | #define tw_bound_dev_if __tw_common.skc_bound_dev_if | |
3ab5aee7 | 108 | #define tw_node __tw_common.skc_nulls_node |
8feaf0c0 ACM |
109 | #define tw_bind_node __tw_common.skc_bind_node |
110 | #define tw_refcnt __tw_common.skc_refcnt | |
81c3d547 | 111 | #define tw_hash __tw_common.skc_hash |
8feaf0c0 | 112 | #define tw_prot __tw_common.skc_prot |
07feaebf | 113 | #define tw_net __tw_common.skc_net |
68835aba ED |
114 | #define tw_daddr __tw_common.skc_daddr |
115 | #define tw_rcv_saddr __tw_common.skc_rcv_saddr | |
ad8bb780 | 116 | int tw_timeout; |
8feaf0c0 | 117 | volatile unsigned char tw_substate; |
8feaf0c0 | 118 | unsigned char tw_rcv_wscale; |
68835aba | 119 | |
8feaf0c0 | 120 | /* Socket demultiplex comparisons on incoming packets. */ |
68835aba | 121 | /* these three are in inet_sock */ |
23f33c2d | 122 | __be16 tw_sport; |
23f33c2d | 123 | __be16 tw_dport; |
8feaf0c0 | 124 | __u16 tw_num; |
9e337b0f | 125 | kmemcheck_bitfield_begin(flags); |
8feaf0c0 | 126 | /* And these are ours. */ |
abf90cca ED |
127 | unsigned int tw_ipv6only : 1, |
128 | tw_transparent : 1, | |
129 | tw_pad : 14, /* 14 bits hole */ | |
130 | tw_ipv6_offset : 16; | |
9e337b0f | 131 | kmemcheck_bitfield_end(flags); |
8feaf0c0 ACM |
132 | unsigned long tw_ttd; |
133 | struct inet_bind_bucket *tw_tb; | |
134 | struct hlist_node tw_death_node; | |
135 | }; | |
136 | ||
3ab5aee7 ED |
137 | static inline void inet_twsk_add_node_rcu(struct inet_timewait_sock *tw, |
138 | struct hlist_nulls_head *list) | |
8feaf0c0 | 139 | { |
3ab5aee7 | 140 | hlist_nulls_add_head_rcu(&tw->tw_node, list); |
8feaf0c0 ACM |
141 | } |
142 | ||
143 | static inline void inet_twsk_add_bind_node(struct inet_timewait_sock *tw, | |
144 | struct hlist_head *list) | |
145 | { | |
146 | hlist_add_head(&tw->tw_bind_node, list); | |
147 | } | |
148 | ||
149 | static inline int inet_twsk_dead_hashed(const struct inet_timewait_sock *tw) | |
150 | { | |
da753bea | 151 | return !hlist_unhashed(&tw->tw_death_node); |
8feaf0c0 ACM |
152 | } |
153 | ||
154 | static inline void inet_twsk_dead_node_init(struct inet_timewait_sock *tw) | |
155 | { | |
156 | tw->tw_death_node.pprev = NULL; | |
157 | } | |
158 | ||
159 | static inline void __inet_twsk_del_dead_node(struct inet_timewait_sock *tw) | |
160 | { | |
161 | __hlist_del(&tw->tw_death_node); | |
162 | inet_twsk_dead_node_init(tw); | |
163 | } | |
164 | ||
165 | static inline int inet_twsk_del_dead_node(struct inet_timewait_sock *tw) | |
166 | { | |
167 | if (inet_twsk_dead_hashed(tw)) { | |
168 | __inet_twsk_del_dead_node(tw); | |
169 | return 1; | |
170 | } | |
171 | return 0; | |
172 | } | |
173 | ||
174 | #define inet_twsk_for_each(tw, node, head) \ | |
3ab5aee7 | 175 | hlist_nulls_for_each_entry(tw, node, head, tw_node) |
8feaf0c0 ACM |
176 | |
177 | #define inet_twsk_for_each_inmate(tw, node, jail) \ | |
178 | hlist_for_each_entry(tw, node, jail, tw_death_node) | |
179 | ||
180 | #define inet_twsk_for_each_inmate_safe(tw, node, safe, jail) \ | |
181 | hlist_for_each_entry_safe(tw, node, safe, jail, tw_death_node) | |
182 | ||
183 | static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk) | |
184 | { | |
185 | return (struct inet_timewait_sock *)sk; | |
186 | } | |
187 | ||
68835aba | 188 | static inline __be32 sk_rcv_saddr(const struct sock *sk) |
8feaf0c0 | 189 | { |
68835aba ED |
190 | /* both inet_sk() and inet_twsk() store rcv_saddr in skc_rcv_saddr */ |
191 | return sk->__sk_common.skc_rcv_saddr; | |
8feaf0c0 ACM |
192 | } |
193 | ||
7054fb93 | 194 | extern void inet_twsk_put(struct inet_timewait_sock *tw); |
e48c414e | 195 | |
13475a30 ED |
196 | extern int inet_twsk_unhash(struct inet_timewait_sock *tw); |
197 | ||
3cdaedae ED |
198 | extern int inet_twsk_bind_unhash(struct inet_timewait_sock *tw, |
199 | struct inet_hashinfo *hashinfo); | |
200 | ||
c676270b ACM |
201 | extern struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk, |
202 | const int state); | |
203 | ||
e48c414e ACM |
204 | extern void __inet_twsk_hashdance(struct inet_timewait_sock *tw, |
205 | struct sock *sk, | |
206 | struct inet_hashinfo *hashinfo); | |
696ab2d3 ACM |
207 | |
208 | extern 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 | extern void inet_twsk_deschedule(struct inet_timewait_sock *tw, | |
212 | struct inet_timewait_death_row *twdr); | |
3b1e0a65 | 213 | |
b099ce26 | 214 | extern void inet_twsk_purge(struct inet_hashinfo *hashinfo, |
d315492b DL |
215 | struct inet_timewait_death_row *twdr, int family); |
216 | ||
3b1e0a65 YH |
217 | static inline |
218 | struct net *twsk_net(const struct inet_timewait_sock *twsk) | |
219 | { | |
220 | #ifdef CONFIG_NET_NS | |
7ec75c58 PM |
221 | return rcu_dereference_raw(twsk->tw_net); /* protected by locking, */ |
222 | /* reference counting, */ | |
223 | /* initialization, or RCU. */ | |
3b1e0a65 YH |
224 | #else |
225 | return &init_net; | |
226 | #endif | |
227 | } | |
228 | ||
229 | static inline | |
f5aa23fd | 230 | void twsk_net_set(struct inet_timewait_sock *twsk, struct net *net) |
3b1e0a65 YH |
231 | { |
232 | #ifdef CONFIG_NET_NS | |
b099ce26 | 233 | rcu_assign_pointer(twsk->tw_net, net); |
3b1e0a65 YH |
234 | #endif |
235 | } | |
8feaf0c0 | 236 | #endif /* _INET_TIMEWAIT_SOCK_ */ |