LXR linux/include/net/inet_timewait

   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
  30struct 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 */
  37struct 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
  82static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk)
  83{
  84        return (struct inet_timewait_sock *)sk;
  85}
  86
  87void inet_twsk_free(struct inet_timewait_sock *tw);
  88void inet_twsk_put(struct inet_timewait_sock *tw);
  89
  90void inet_twsk_bind_unhash(struct inet_timewait_sock *tw,
  91                           struct inet_hashinfo *hashinfo);
  92
  93struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk,
  94                                           struct inet_timewait_death_row *dr,
  95                                           const int state);
  96
  97void inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk,
  98                         struct inet_hashinfo *hashinfo);
  99
 100void __inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo,
 101                          bool rearm);
 102
 103static inline void inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo)
 104{
 105        __inet_twsk_schedule(tw, timeo, false);
 106}
 107
 108static inline void inet_twsk_reschedule(struct inet_timewait_sock *tw, int timeo)
 109{
 110        __inet_twsk_schedule(tw, timeo, true);
 111}
 112
 113void inet_twsk_deschedule_put(struct inet_timewait_sock *tw);
 114
 115void inet_twsk_purge(struct inet_hashinfo *hashinfo, int family);
 116
 117static inline
 118struct net *twsk_net(const struct inet_timewait_sock *twsk)
 119{
 120        return read_pnet(&twsk->tw_net);
 121}
 122
 123static inline
 124void 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_ */
 129