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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
32struct 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
39
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
62#define INET_TWDR_TWKILL_SLOTS 8
63
64#define INET_TWDR_TWKILL_QUOTA 100
65
66struct inet_timewait_death_row {
67
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
86extern void inet_twdr_hangman(unsigned long data);
87extern void inet_twdr_twkill_work(struct work_struct *work);
88extern void inet_twdr_twcal_tick(unsigned long data);
89
90struct inet_bind_bucket;
91
92
93
94
95
96
97struct inet_timewait_sock {
98
99
100
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
125
126 __be16 tw_sport;
127 kmemcheck_bitfield_begin(flags);
128
129 unsigned int tw_ipv6only : 1,
130 tw_transparent : 1,
131 tw_pad : 6,
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
141static 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
147static 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
153static inline int inet_twsk_dead_hashed(const struct inet_timewait_sock *tw)
154{
155 return !hlist_unhashed(&tw->tw_death_node);
156}
157
158static inline void inet_twsk_dead_node_init(struct inet_timewait_sock *tw)
159{
160 tw->tw_death_node.pprev = NULL;
161}
162
163static 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
169static 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
187static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk)
188{
189 return (struct inet_timewait_sock *)sk;
190}
191
192static inline __be32 sk_rcv_saddr(const struct sock *sk)
193{
194
195 return sk->__sk_common.skc_rcv_saddr;
196}
197
198extern void inet_twsk_put(struct inet_timewait_sock *tw);
199
200extern int inet_twsk_unhash(struct inet_timewait_sock *tw);
201
202extern int inet_twsk_bind_unhash(struct inet_timewait_sock *tw,
203 struct inet_hashinfo *hashinfo);
204
205extern struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk,
206 const int state);
207
208extern void __inet_twsk_hashdance(struct inet_timewait_sock *tw,
209 struct sock *sk,
210 struct inet_hashinfo *hashinfo);
211
212extern void inet_twsk_schedule(struct inet_timewait_sock *tw,
213 struct inet_timewait_death_row *twdr,
214 const int timeo, const int timewait_len);
215extern void inet_twsk_deschedule(struct inet_timewait_sock *tw,
216 struct inet_timewait_death_row *twdr);
217
218extern void inet_twsk_purge(struct inet_hashinfo *hashinfo,
219 struct inet_timewait_death_row *twdr, int family);
220
221static inline
222struct net *twsk_net(const struct inet_timewait_sock *twsk)
223{
224 return read_pnet(&twsk->tw_net);
225}
226
227static inline
228void twsk_net_set(struct inet_timewait_sock *twsk, struct net *net)
229{
230 write_pnet(&twsk->tw_net, net);
231}
232#endif
233