xt_osf.c 1.7 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * Copyright (c) 2003+ Evgeniy Polyakov <zbr@ioremap.net>
  4. */
  5. #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  6. #include <linux/module.h>
  7. #include <linux/kernel.h>
  8. #include <linux/capability.h>
  9. #include <linux/if.h>
  10. #include <linux/inetdevice.h>
  11. #include <linux/ip.h>
  12. #include <linux/list.h>
  13. #include <linux/rculist.h>
  14. #include <linux/skbuff.h>
  15. #include <linux/slab.h>
  16. #include <linux/tcp.h>
  17. #include <net/ip.h>
  18. #include <net/tcp.h>
  19. #include <linux/netfilter/nfnetlink.h>
  20. #include <linux/netfilter/x_tables.h>
  21. #include <net/netfilter/nf_log.h>
  22. #include <linux/netfilter/xt_osf.h>
  23. static bool
  24. xt_osf_match_packet(const struct sk_buff *skb, struct xt_action_param *p)
  25. {
  26. return nf_osf_match(skb, xt_family(p), xt_hooknum(p), xt_in(p),
  27. xt_out(p), p->matchinfo, xt_net(p), nf_osf_fingers);
  28. }
  29. static struct xt_match xt_osf_match = {
  30. .name = "osf",
  31. .revision = 0,
  32. .family = NFPROTO_IPV4,
  33. .proto = IPPROTO_TCP,
  34. .hooks = (1 << NF_INET_LOCAL_IN) |
  35. (1 << NF_INET_PRE_ROUTING) |
  36. (1 << NF_INET_FORWARD),
  37. .match = xt_osf_match_packet,
  38. .matchsize = sizeof(struct xt_osf_info),
  39. .me = THIS_MODULE,
  40. };
  41. static int __init xt_osf_init(void)
  42. {
  43. int err;
  44. err = xt_register_match(&xt_osf_match);
  45. if (err) {
  46. pr_err("Failed to register OS fingerprint "
  47. "matching module (%d)\n", err);
  48. return err;
  49. }
  50. return 0;
  51. }
  52. static void __exit xt_osf_fini(void)
  53. {
  54. xt_unregister_match(&xt_osf_match);
  55. }
  56. module_init(xt_osf_init);
  57. module_exit(xt_osf_fini);
  58. MODULE_LICENSE("GPL");
  59. MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>");
  60. MODULE_DESCRIPTION("Passive OS fingerprint matching.");
  61. MODULE_ALIAS("ipt_osf");
  62. MODULE_ALIAS("ip6t_osf");
  63. MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_OSF);