tcp_diag.c 2.3 KB

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  1. /*
  2. * tcp_diag.c Module for monitoring TCP transport protocols sockets.
  3. *
  4. * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  5. *
  6. * This program is free software; you can redistribute it and/or
  7. * modify it under the terms of the GNU General Public License
  8. * as published by the Free Software Foundation; either version
  9. * 2 of the License, or (at your option) any later version.
  10. */
  11. #include <linux/module.h>
  12. #include <linux/net.h>
  13. #include <linux/sock_diag.h>
  14. #include <linux/inet_diag.h>
  15. #include <linux/tcp.h>
  16. #include <net/tcp.h>
  17. static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
  18. void *_info)
  19. {
  20. const struct tcp_sock *tp = tcp_sk(sk);
  21. struct tcp_info *info = _info;
  22. if (sk->sk_state == TCP_LISTEN) {
  23. r->idiag_rqueue = sk->sk_ack_backlog;
  24. r->idiag_wqueue = sk->sk_max_ack_backlog;
  25. } else {
  26. r->idiag_rqueue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0);
  27. r->idiag_wqueue = tp->write_seq - tp->snd_una;
  28. }
  29. if (info != NULL)
  30. tcp_get_info(sk, info);
  31. }
  32. static void tcp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
  33. struct inet_diag_req_v2 *r, struct nlattr *bc)
  34. {
  35. inet_diag_dump_icsk(&tcp_hashinfo, skb, cb, r, bc);
  36. }
  37. static int tcp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
  38. struct inet_diag_req_v2 *req)
  39. {
  40. return inet_diag_dump_one_icsk(&tcp_hashinfo, in_skb, nlh, req);
  41. }
  42. #ifdef CONFIG_INET_DIAG_DESTROY
  43. static int tcp_diag_destroy(struct sk_buff *in_skb,
  44. struct inet_diag_req_v2 *req)
  45. {
  46. struct net *net = sock_net(in_skb->sk);
  47. struct sock *sk = inet_diag_find_one_icsk(net, &tcp_hashinfo, req);
  48. if (IS_ERR(sk))
  49. return PTR_ERR(sk);
  50. return sock_diag_destroy(sk, ECONNABORTED);
  51. }
  52. #endif
  53. static const struct inet_diag_handler tcp_diag_handler = {
  54. .dump = tcp_diag_dump,
  55. .dump_one = tcp_diag_dump_one,
  56. .idiag_get_info = tcp_diag_get_info,
  57. .idiag_type = IPPROTO_TCP,
  58. #ifdef CONFIG_INET_DIAG_DESTROY
  59. .destroy = tcp_diag_destroy,
  60. #endif
  61. };
  62. static int __init tcp_diag_init(void)
  63. {
  64. return inet_diag_register(&tcp_diag_handler);
  65. }
  66. static void __exit tcp_diag_exit(void)
  67. {
  68. inet_diag_unregister(&tcp_diag_handler);
  69. }
  70. module_init(tcp_diag_init);
  71. module_exit(tcp_diag_exit);
  72. MODULE_LICENSE("GPL");
  73. MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-6 /* AF_INET - IPPROTO_TCP */);