include/net/inet_timewait_sock.h

   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 #include <linux/list.h>
  19 #include <linux/timer.h>
  20 #include <linux/types.h>
  21 #include <linux/workqueue.h>
  22
  23 #include <net/inet_sock.h>
  24 #include <net/sock.h>
  25 #include <net/tcp_states.h>
  26 #include <net/timewait_sock.h>
  27
  28 #include <linux/atomic.h>
  29
  30 struct inet_bind_bucket;
  31
  32 /*
  33  * This is a TIME_WAIT sock. It works around the memory consumption
  34  * problems of sockets in such a state on heavily loaded servers, but
  35  * without violating the protocol specification.
  36  */
  37 struct inet_timewait_sock {
  38         /*
  39          * Now struct sock also uses sock_common, so please just
  40          * don't add nothing before this first member (__tw_common) --acme
  41          */
  42         struct sock_common      __tw_common;
  43 #define tw_family               __tw_common.skc_family
  44 #define tw_state                __tw_common.skc_state
  45 #define tw_reuse                __tw_common.skc_reuse
  46 #define tw_reuseport            __tw_common.skc_reuseport
  47 #define tw_ipv6only             __tw_common.skc_ipv6only
  48 #define tw_bound_dev_if         __tw_common.skc_bound_dev_if
  49 #define tw_node                 __tw_common.skc_nulls_node
  50 #define tw_bind_node            __tw_common.skc_bind_node
  51 #define tw_refcnt               __tw_common.skc_refcnt
  52 #define tw_hash                 __tw_common.skc_hash
  53 #define tw_prot                 __tw_common.skc_prot
  54 #define tw_net                  __tw_common.skc_net
  55 #define tw_daddr                __tw_common.skc_daddr
  56 #define tw_v6_daddr             __tw_common.skc_v6_daddr
  57 #define tw_rcv_saddr            __tw_common.skc_rcv_saddr
  58 #define tw_v6_rcv_saddr         __tw_common.skc_v6_rcv_saddr
  59 #define tw_dport                __tw_common.skc_dport
  60 #define tw_num                  __tw_common.skc_num
  61 #define tw_cookie               __tw_common.skc_cookie
  62 #define tw_dr                   __tw_common.skc_tw_dr
  63
  64         int                     tw_timeout;
  65         volatile unsigned char  tw_substate;
  66         unsigned char           tw_rcv_wscale;
  67
  68         /* Socket demultiplex comparisons on incoming packets. */
  69         /* these three are in inet_sock */
  70         __be16                  tw_sport;
  71         /* And these are ours. */
  72         unsigned int            tw_kill         : 1,
  73                                 tw_transparent  : 1,
  74                                 tw_flowlabel    : 20,
  75                                 tw_pad          : 2,    /* 2 bits hole */
  76                                 tw_tos          : 8;
  77         struct timer_list       tw_timer;
  78         struct inet_bind_bucket *tw_tb;
  79 };
  80 #define tw_tclass tw_tos
  81
  82 static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk)
  83 {
  84         return (struct inet_timewait_sock *)sk;
  85 }
  86
  87 void inet_twsk_free(struct inet_timewait_sock *tw);
  88 void inet_twsk_put(struct inet_timewait_sock *tw);
  89
  90 void inet_twsk_bind_unhash(struct inet_timewait_sock *tw,
  91                            struct inet_hashinfo *hashinfo);
  92
  93 struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk,
  94                                            struct inet_timewait_death_row *dr,
  95                                            const int state);
  96
  97 void inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk,
  98                          struct inet_hashinfo *hashinfo);
  99
 100 void __inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo,
 101                           bool rearm);
 102
 103 static inline void inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo)
 104 {
 105         __inet_twsk_schedule(tw, timeo, false);
 106 }
 107
 108 static inline void inet_twsk_reschedule(struct inet_timewait_sock *tw, int timeo)
 109 {
 110         __inet_twsk_schedule(tw, timeo, true);
 111 }
 112
 113 void inet_twsk_deschedule_put(struct inet_timewait_sock *tw);
 114
 115 void inet_twsk_purge(struct inet_hashinfo *hashinfo, int family);
 116
 117 static inline
 118 struct net *twsk_net(const struct inet_timewait_sock *twsk)
 119 {
 120         return read_pnet(&twsk->tw_net);
 121 }
 122
 123 static inline
 124 void twsk_net_set(struct inet_timewait_sock *twsk, struct net *net)
 125 {
 126         write_pnet(&twsk->tw_net, net);
 127 }
 128 #endif  /* _INET_TIMEWAIT_SOCK_ */