nft_reject.c 3.1 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
  4. * Copyright (c) 2013 Eric Leblond <eric@regit.org>
  5. *
  6. * Development of this code funded by Astaro AG (http://www.astaro.com/)
  7. */
  8. #include <linux/kernel.h>
  9. #include <linux/init.h>
  10. #include <linux/module.h>
  11. #include <linux/netlink.h>
  12. #include <linux/netfilter.h>
  13. #include <linux/netfilter/nf_tables.h>
  14. #include <net/netfilter/nf_tables.h>
  15. #include <net/netfilter/nft_reject.h>
  16. #include <linux/icmp.h>
  17. #include <linux/icmpv6.h>
  18. const struct nla_policy nft_reject_policy[NFTA_REJECT_MAX + 1] = {
  19. [NFTA_REJECT_TYPE] = { .type = NLA_U32 },
  20. [NFTA_REJECT_ICMP_CODE] = { .type = NLA_U8 },
  21. };
  22. EXPORT_SYMBOL_GPL(nft_reject_policy);
  23. int nft_reject_validate(const struct nft_ctx *ctx,
  24. const struct nft_expr *expr,
  25. const struct nft_data **data)
  26. {
  27. return nft_chain_validate_hooks(ctx->chain,
  28. (1 << NF_INET_LOCAL_IN) |
  29. (1 << NF_INET_FORWARD) |
  30. (1 << NF_INET_LOCAL_OUT) |
  31. (1 << NF_INET_PRE_ROUTING));
  32. }
  33. EXPORT_SYMBOL_GPL(nft_reject_validate);
  34. int nft_reject_init(const struct nft_ctx *ctx,
  35. const struct nft_expr *expr,
  36. const struct nlattr * const tb[])
  37. {
  38. struct nft_reject *priv = nft_expr_priv(expr);
  39. if (tb[NFTA_REJECT_TYPE] == NULL)
  40. return -EINVAL;
  41. priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE]));
  42. switch (priv->type) {
  43. case NFT_REJECT_ICMP_UNREACH:
  44. if (tb[NFTA_REJECT_ICMP_CODE] == NULL)
  45. return -EINVAL;
  46. priv->icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
  47. case NFT_REJECT_TCP_RST:
  48. break;
  49. default:
  50. return -EINVAL;
  51. }
  52. return 0;
  53. }
  54. EXPORT_SYMBOL_GPL(nft_reject_init);
  55. int nft_reject_dump(struct sk_buff *skb, const struct nft_expr *expr)
  56. {
  57. const struct nft_reject *priv = nft_expr_priv(expr);
  58. if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type)))
  59. goto nla_put_failure;
  60. switch (priv->type) {
  61. case NFT_REJECT_ICMP_UNREACH:
  62. if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code))
  63. goto nla_put_failure;
  64. break;
  65. default:
  66. break;
  67. }
  68. return 0;
  69. nla_put_failure:
  70. return -1;
  71. }
  72. EXPORT_SYMBOL_GPL(nft_reject_dump);
  73. static u8 icmp_code_v4[NFT_REJECT_ICMPX_MAX + 1] = {
  74. [NFT_REJECT_ICMPX_NO_ROUTE] = ICMP_NET_UNREACH,
  75. [NFT_REJECT_ICMPX_PORT_UNREACH] = ICMP_PORT_UNREACH,
  76. [NFT_REJECT_ICMPX_HOST_UNREACH] = ICMP_HOST_UNREACH,
  77. [NFT_REJECT_ICMPX_ADMIN_PROHIBITED] = ICMP_PKT_FILTERED,
  78. };
  79. int nft_reject_icmp_code(u8 code)
  80. {
  81. if (WARN_ON_ONCE(code > NFT_REJECT_ICMPX_MAX))
  82. return ICMP_NET_UNREACH;
  83. return icmp_code_v4[code];
  84. }
  85. EXPORT_SYMBOL_GPL(nft_reject_icmp_code);
  86. static u8 icmp_code_v6[NFT_REJECT_ICMPX_MAX + 1] = {
  87. [NFT_REJECT_ICMPX_NO_ROUTE] = ICMPV6_NOROUTE,
  88. [NFT_REJECT_ICMPX_PORT_UNREACH] = ICMPV6_PORT_UNREACH,
  89. [NFT_REJECT_ICMPX_HOST_UNREACH] = ICMPV6_ADDR_UNREACH,
  90. [NFT_REJECT_ICMPX_ADMIN_PROHIBITED] = ICMPV6_ADM_PROHIBITED,
  91. };
  92. int nft_reject_icmpv6_code(u8 code)
  93. {
  94. if (WARN_ON_ONCE(code > NFT_REJECT_ICMPX_MAX))
  95. return ICMPV6_NOROUTE;
  96. return icmp_code_v6[code];
  97. }
  98. EXPORT_SYMBOL_GPL(nft_reject_icmpv6_code);
  99. MODULE_LICENSE("GPL");
  100. MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
  101. MODULE_DESCRIPTION("Netfilter x_tables over nftables module");