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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
32struct inet_hashinfo;
33
34struct inet_timewait_death_row {
35 atomic_t tw_count;
36
37 struct inet_hashinfo *hashinfo ____cacheline_aligned_in_smp;
38 int sysctl_tw_recycle;
39 int sysctl_max_tw_buckets;
40};
41
42struct inet_bind_bucket;
43
44/*
45 * This is a TIME_WAIT sock. It works around the memory consumption
46 * problems of sockets in such a state on heavily loaded servers, but
47 * without violating the protocol specification.
48 */
49struct inet_timewait_sock {
50 /*
51 * Now struct sock also uses sock_common, so please just
52 * don't add nothing before this first member (__tw_common) --acme
53 */
54 struct sock_common __tw_common;
55#define tw_family __tw_common.skc_family
56#define tw_state __tw_common.skc_state
57#define tw_reuse __tw_common.skc_reuse
58#define tw_ipv6only __tw_common.skc_ipv6only
59#define tw_bound_dev_if __tw_common.skc_bound_dev_if
60#define tw_node __tw_common.skc_nulls_node
61#define tw_bind_node __tw_common.skc_bind_node
62#define tw_refcnt __tw_common.skc_refcnt
63#define tw_hash __tw_common.skc_hash
64#define tw_prot __tw_common.skc_prot
65#define tw_net __tw_common.skc_net
66#define tw_daddr __tw_common.skc_daddr
67#define tw_v6_daddr __tw_common.skc_v6_daddr
68#define tw_rcv_saddr __tw_common.skc_rcv_saddr
69#define tw_v6_rcv_saddr __tw_common.skc_v6_rcv_saddr
70#define tw_dport __tw_common.skc_dport
71#define tw_num __tw_common.skc_num
72#define tw_cookie __tw_common.skc_cookie
73#define tw_dr __tw_common.skc_tw_dr
74
75 int tw_timeout;
76 volatile unsigned char tw_substate;
77 unsigned char tw_rcv_wscale;
78
79 /* Socket demultiplex comparisons on incoming packets. */
80 /* these three are in inet_sock */
81 __be16 tw_sport;
82 kmemcheck_bitfield_begin(flags);
83 /* And these are ours. */
84 unsigned int tw_kill : 1,
85 tw_transparent : 1,
86 tw_flowlabel : 20,
87 tw_pad : 2, /* 2 bits hole */
88 tw_tos : 8;
89 kmemcheck_bitfield_end(flags);
90 struct timer_list tw_timer;
91 struct inet_bind_bucket *tw_tb;
92};
93#define tw_tclass tw_tos
94
95static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk)
96{
97 return (struct inet_timewait_sock *)sk;
98}
99
100void inet_twsk_free(struct inet_timewait_sock *tw);
101void inet_twsk_put(struct inet_timewait_sock *tw);
102
103void inet_twsk_bind_unhash(struct inet_timewait_sock *tw,
104 struct inet_hashinfo *hashinfo);
105
106struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk,
107 struct inet_timewait_death_row *dr,
108 const int state);
109
110void __inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk,
111 struct inet_hashinfo *hashinfo);
112
113void __inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo,
114 bool rearm);
115
116static inline void inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo)
117{
118 __inet_twsk_schedule(tw, timeo, false);
119}
120
121static inline void inet_twsk_reschedule(struct inet_timewait_sock *tw, int timeo)
122{
123 __inet_twsk_schedule(tw, timeo, true);
124}
125
126void inet_twsk_deschedule_put(struct inet_timewait_sock *tw);
127
128void inet_twsk_purge(struct inet_hashinfo *hashinfo,
129 struct inet_timewait_death_row *twdr, int family);
130
131static inline
132struct net *twsk_net(const struct inet_timewait_sock *twsk)
133{
134 return read_pnet(&twsk->tw_net);
135}
136
137static inline
138void twsk_net_set(struct inet_timewait_sock *twsk, struct net *net)
139{
140 write_pnet(&twsk->tw_net, net);
141}
142#endif /* _INET_TIMEWAIT_SOCK_ */
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
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 * 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
66struct 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
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 * 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 */
97struct 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 int tw_timeout;
116 volatile unsigned char tw_substate;
117 unsigned char tw_rcv_wscale;
118
119 /* Socket demultiplex comparisons on incoming packets. */
120 /* these three are in inet_sock */
121 __be16 tw_sport;
122 __be16 tw_dport;
123 __u16 tw_num;
124 kmemcheck_bitfield_begin(flags);
125 /* And these are ours. */
126 unsigned int tw_ipv6only : 1,
127 tw_transparent : 1,
128 tw_pad : 6, /* 6 bits hole */
129 tw_tos : 8,
130 tw_ipv6_offset : 16;
131 kmemcheck_bitfield_end(flags);
132 unsigned long tw_ttd;
133 struct inet_bind_bucket *tw_tb;
134 struct hlist_node tw_death_node;
135};
136#define tw_tclass tw_tos
137
138static inline void inet_twsk_add_node_rcu(struct inet_timewait_sock *tw,
139 struct hlist_nulls_head *list)
140{
141 hlist_nulls_add_head_rcu(&tw->tw_node, list);
142}
143
144static inline void inet_twsk_add_bind_node(struct inet_timewait_sock *tw,
145 struct hlist_head *list)
146{
147 hlist_add_head(&tw->tw_bind_node, list);
148}
149
150static inline int inet_twsk_dead_hashed(const struct inet_timewait_sock *tw)
151{
152 return !hlist_unhashed(&tw->tw_death_node);
153}
154
155static inline void inet_twsk_dead_node_init(struct inet_timewait_sock *tw)
156{
157 tw->tw_death_node.pprev = NULL;
158}
159
160static inline void __inet_twsk_del_dead_node(struct inet_timewait_sock *tw)
161{
162 __hlist_del(&tw->tw_death_node);
163 inet_twsk_dead_node_init(tw);
164}
165
166static inline int inet_twsk_del_dead_node(struct inet_timewait_sock *tw)
167{
168 if (inet_twsk_dead_hashed(tw)) {
169 __inet_twsk_del_dead_node(tw);
170 return 1;
171 }
172 return 0;
173}
174
175#define inet_twsk_for_each(tw, node, head) \
176 hlist_nulls_for_each_entry(tw, node, head, tw_node)
177
178#define inet_twsk_for_each_inmate(tw, node, jail) \
179 hlist_for_each_entry(tw, node, jail, tw_death_node)
180
181#define inet_twsk_for_each_inmate_safe(tw, node, safe, jail) \
182 hlist_for_each_entry_safe(tw, node, safe, jail, tw_death_node)
183
184static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk)
185{
186 return (struct inet_timewait_sock *)sk;
187}
188
189static inline __be32 sk_rcv_saddr(const struct sock *sk)
190{
191/* both inet_sk() and inet_twsk() store rcv_saddr in skc_rcv_saddr */
192 return sk->__sk_common.skc_rcv_saddr;
193}
194
195extern void inet_twsk_put(struct inet_timewait_sock *tw);
196
197extern int inet_twsk_unhash(struct inet_timewait_sock *tw);
198
199extern int inet_twsk_bind_unhash(struct inet_timewait_sock *tw,
200 struct inet_hashinfo *hashinfo);
201
202extern struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk,
203 const int state);
204
205extern void __inet_twsk_hashdance(struct inet_timewait_sock *tw,
206 struct sock *sk,
207 struct inet_hashinfo *hashinfo);
208
209extern void inet_twsk_schedule(struct inet_timewait_sock *tw,
210 struct inet_timewait_death_row *twdr,
211 const int timeo, const int timewait_len);
212extern void inet_twsk_deschedule(struct inet_timewait_sock *tw,
213 struct inet_timewait_death_row *twdr);
214
215extern void inet_twsk_purge(struct inet_hashinfo *hashinfo,
216 struct inet_timewait_death_row *twdr, int family);
217
218static inline
219struct net *twsk_net(const struct inet_timewait_sock *twsk)
220{
221 return read_pnet(&twsk->tw_net);
222}
223
224static inline
225void twsk_net_set(struct inet_timewait_sock *twsk, struct net *net)
226{
227 write_pnet(&twsk->tw_net, net);
228}
229#endif /* _INET_TIMEWAIT_SOCK_ */