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Linux/include/net/inet_timewait_sock.h

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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 
 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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