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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 struct 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 
 42 struct 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  */
 49 struct 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 
 95 static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk)
 96 {
 97         return (struct inet_timewait_sock *)sk;
 98 }
 99 
100 void inet_twsk_free(struct inet_timewait_sock *tw);
101 void inet_twsk_put(struct inet_timewait_sock *tw);
102 
103 void inet_twsk_bind_unhash(struct inet_timewait_sock *tw,
104                            struct inet_hashinfo *hashinfo);
105 
106 struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk,
107                                            struct inet_timewait_death_row *dr,
108                                            const int state);
109 
110 void __inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk,
111                            struct inet_hashinfo *hashinfo);
112 
113 void __inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo,
114                           bool rearm);
115 
116 static inline void inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo)
117 {
118         __inet_twsk_schedule(tw, timeo, false);
119 }
120 
121 static inline void inet_twsk_reschedule(struct inet_timewait_sock *tw, int timeo)
122 {
123         __inet_twsk_schedule(tw, timeo, true);
124 }
125 
126 void inet_twsk_deschedule_put(struct inet_timewait_sock *tw);
127 
128 void inet_twsk_purge(struct inet_hashinfo *hashinfo,
129                      struct inet_timewait_death_row *twdr, int family);
130 
131 static inline
132 struct net *twsk_net(const struct inet_timewait_sock *twsk)
133 {
134         return read_pnet(&twsk->tw_net);
135 }
136 
137 static inline
138 void 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_ */
143 

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