Root/
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 | |
19 | #include <linux/kmemcheck.h> |
20 | #include <linux/list.h> |
21 | #include <linux/timer.h> |
22 | #include <linux/types.h> |
23 | #include <linux/workqueue.h> |
24 | |
25 | #include <net/inet_sock.h> |
26 | #include <net/sock.h> |
27 | #include <net/tcp_states.h> |
28 | #include <net/timewait_sock.h> |
29 | |
30 | #include <linux/atomic.h> |
31 | |
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 | |
61 | /* TIME_WAIT reaping mechanism. */ |
62 | #define INET_TWDR_TWKILL_SLOTS 8 /* Please keep this a power of 2. */ |
63 | |
64 | #define INET_TWDR_TWKILL_QUOTA 100 |
65 | |
66 | struct inet_timewait_death_row { |
67 | /* Short-time timewait calendar */ |
68 | int twcal_hand; |
69 | unsigned long twcal_jiffie; |
70 | struct timer_list twcal_timer; |
71 | struct hlist_head twcal_row[INET_TWDR_RECYCLE_SLOTS]; |
72 | |
73 | spinlock_t death_lock; |
74 | int tw_count; |
75 | int period; |
76 | u32 thread_slots; |
77 | struct work_struct twkill_work; |
78 | struct timer_list tw_timer; |
79 | int slot; |
80 | struct hlist_head cells[INET_TWDR_TWKILL_SLOTS]; |
81 | struct inet_hashinfo *hashinfo; |
82 | int sysctl_tw_recycle; |
83 | int sysctl_max_tw_buckets; |
84 | }; |
85 | |
86 | extern void inet_twdr_hangman(unsigned long data); |
87 | extern void inet_twdr_twkill_work(struct work_struct *work); |
88 | extern void inet_twdr_twcal_tick(unsigned long data); |
89 | |
90 | struct inet_bind_bucket; |
91 | |
92 | /* |
93 | * This is a TIME_WAIT sock. It works around the memory consumption |
94 | * problems of sockets in such a state on heavily loaded servers, but |
95 | * without violating the protocol specification. |
96 | */ |
97 | struct inet_timewait_sock { |
98 | /* |
99 | * Now struct sock also uses sock_common, so please just |
100 | * don't add nothing before this first member (__tw_common) --acme |
101 | */ |
102 | struct sock_common __tw_common; |
103 | #define tw_family __tw_common.skc_family |
104 | #define tw_state __tw_common.skc_state |
105 | #define tw_reuse __tw_common.skc_reuse |
106 | #define tw_bound_dev_if __tw_common.skc_bound_dev_if |
107 | #define tw_node __tw_common.skc_nulls_node |
108 | #define tw_bind_node __tw_common.skc_bind_node |
109 | #define tw_refcnt __tw_common.skc_refcnt |
110 | #define tw_hash __tw_common.skc_hash |
111 | #define tw_prot __tw_common.skc_prot |
112 | #define tw_net __tw_common.skc_net |
113 | #define tw_daddr __tw_common.skc_daddr |
114 | #define tw_rcv_saddr __tw_common.skc_rcv_saddr |
115 | #define tw_addrpair __tw_common.skc_addrpair |
116 | #define tw_dport __tw_common.skc_dport |
117 | #define tw_num __tw_common.skc_num |
118 | #define tw_portpair __tw_common.skc_portpair |
119 | |
120 | int tw_timeout; |
121 | volatile unsigned char tw_substate; |
122 | unsigned char tw_rcv_wscale; |
123 | |
124 | /* Socket demultiplex comparisons on incoming packets. */ |
125 | /* these three are in inet_sock */ |
126 | __be16 tw_sport; |
127 | kmemcheck_bitfield_begin(flags); |
128 | /* And these are ours. */ |
129 | unsigned int tw_ipv6only : 1, |
130 | tw_transparent : 1, |
131 | tw_pad : 6, /* 6 bits hole */ |
132 | tw_tos : 8, |
133 | tw_ipv6_offset : 16; |
134 | kmemcheck_bitfield_end(flags); |
135 | unsigned long tw_ttd; |
136 | struct inet_bind_bucket *tw_tb; |
137 | struct hlist_node tw_death_node; |
138 | }; |
139 | #define tw_tclass tw_tos |
140 | |
141 | static inline void inet_twsk_add_node_rcu(struct inet_timewait_sock *tw, |
142 | struct hlist_nulls_head *list) |
143 | { |
144 | hlist_nulls_add_head_rcu(&tw->tw_node, list); |
145 | } |
146 | |
147 | static inline void inet_twsk_add_bind_node(struct inet_timewait_sock *tw, |
148 | struct hlist_head *list) |
149 | { |
150 | hlist_add_head(&tw->tw_bind_node, list); |
151 | } |
152 | |
153 | static inline int inet_twsk_dead_hashed(const struct inet_timewait_sock *tw) |
154 | { |
155 | return !hlist_unhashed(&tw->tw_death_node); |
156 | } |
157 | |
158 | static inline void inet_twsk_dead_node_init(struct inet_timewait_sock *tw) |
159 | { |
160 | tw->tw_death_node.pprev = NULL; |
161 | } |
162 | |
163 | static inline void __inet_twsk_del_dead_node(struct inet_timewait_sock *tw) |
164 | { |
165 | __hlist_del(&tw->tw_death_node); |
166 | inet_twsk_dead_node_init(tw); |
167 | } |
168 | |
169 | static inline int inet_twsk_del_dead_node(struct inet_timewait_sock *tw) |
170 | { |
171 | if (inet_twsk_dead_hashed(tw)) { |
172 | __inet_twsk_del_dead_node(tw); |
173 | return 1; |
174 | } |
175 | return 0; |
176 | } |
177 | |
178 | #define inet_twsk_for_each(tw, node, head) \ |
179 | hlist_nulls_for_each_entry(tw, node, head, tw_node) |
180 | |
181 | #define inet_twsk_for_each_inmate(tw, jail) \ |
182 | hlist_for_each_entry(tw, jail, tw_death_node) |
183 | |
184 | #define inet_twsk_for_each_inmate_safe(tw, safe, jail) \ |
185 | hlist_for_each_entry_safe(tw, safe, jail, tw_death_node) |
186 | |
187 | static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk) |
188 | { |
189 | return (struct inet_timewait_sock *)sk; |
190 | } |
191 | |
192 | static inline __be32 sk_rcv_saddr(const struct sock *sk) |
193 | { |
194 | /* both inet_sk() and inet_twsk() store rcv_saddr in skc_rcv_saddr */ |
195 | return sk->__sk_common.skc_rcv_saddr; |
196 | } |
197 | |
198 | extern void inet_twsk_put(struct inet_timewait_sock *tw); |
199 | |
200 | extern int inet_twsk_unhash(struct inet_timewait_sock *tw); |
201 | |
202 | extern int inet_twsk_bind_unhash(struct inet_timewait_sock *tw, |
203 | struct inet_hashinfo *hashinfo); |
204 | |
205 | extern struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk, |
206 | const int state); |
207 | |
208 | extern void __inet_twsk_hashdance(struct inet_timewait_sock *tw, |
209 | struct sock *sk, |
210 | struct inet_hashinfo *hashinfo); |
211 | |
212 | extern void inet_twsk_schedule(struct inet_timewait_sock *tw, |
213 | struct inet_timewait_death_row *twdr, |
214 | const int timeo, const int timewait_len); |
215 | extern void inet_twsk_deschedule(struct inet_timewait_sock *tw, |
216 | struct inet_timewait_death_row *twdr); |
217 | |
218 | extern void inet_twsk_purge(struct inet_hashinfo *hashinfo, |
219 | struct inet_timewait_death_row *twdr, int family); |
220 | |
221 | static inline |
222 | struct net *twsk_net(const struct inet_timewait_sock *twsk) |
223 | { |
224 | return read_pnet(&twsk->tw_net); |
225 | } |
226 | |
227 | static inline |
228 | void twsk_net_set(struct inet_timewait_sock *twsk, struct net *net) |
229 | { |
230 | write_pnet(&twsk->tw_net, net); |
231 | } |
232 | #endif /* _INET_TIMEWAIT_SOCK_ */ |
233 |
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