inet_timewait_sock.h 4.1 KB

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