root/net/ipv6/netfilter/nft_dup_ipv6.c

DEFINITIONS

1. nft_dup_ipv6_eval
2. nft_dup_ipv6_init
3. nft_dup_ipv6_dump
4. nft_dup_ipv6_module_init
5. nft_dup_ipv6_module_exit

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org>
   4  */
   5 
   6 #include <linux/kernel.h>
   7 #include <linux/init.h>
   8 #include <linux/module.h>
   9 #include <linux/netlink.h>
  10 #include <linux/netfilter.h>
  11 #include <linux/netfilter/nf_tables.h>
  12 #include <net/netfilter/nf_tables.h>
  13 #include <net/netfilter/ipv6/nf_dup_ipv6.h>
  14 
  15 struct nft_dup_ipv6 {
  16         enum nft_registers      sreg_addr:8;
  17         enum nft_registers      sreg_dev:8;
  18 };
  19 
  20 static void nft_dup_ipv6_eval(const struct nft_expr *expr,
  21                               struct nft_regs *regs,
  22                               const struct nft_pktinfo *pkt)
  23 {
  24         struct nft_dup_ipv6 *priv = nft_expr_priv(expr);
  25         struct in6_addr *gw = (struct in6_addr *)&regs->data[priv->sreg_addr];
  26         int oif = priv->sreg_dev ? regs->data[priv->sreg_dev] : -1;
  27 
  28         nf_dup_ipv6(nft_net(pkt), pkt->skb, nft_hook(pkt), gw, oif);
  29 }
  30 
  31 static int nft_dup_ipv6_init(const struct nft_ctx *ctx,
  32                              const struct nft_expr *expr,
  33                              const struct nlattr * const tb[])
  34 {
  35         struct nft_dup_ipv6 *priv = nft_expr_priv(expr);
  36         int err;
  37 
  38         if (tb[NFTA_DUP_SREG_ADDR] == NULL)
  39                 return -EINVAL;
  40 
  41         priv->sreg_addr = nft_parse_register(tb[NFTA_DUP_SREG_ADDR]);
  42         err = nft_validate_register_load(priv->sreg_addr, sizeof(struct in6_addr));
  43         if (err < 0)
  44                 return err;
  45 
  46         if (tb[NFTA_DUP_SREG_DEV] != NULL) {
  47                 priv->sreg_dev = nft_parse_register(tb[NFTA_DUP_SREG_DEV]);
  48                 return nft_validate_register_load(priv->sreg_dev, sizeof(int));
  49         }
  50         return 0;
  51 }
  52 
  53 static int nft_dup_ipv6_dump(struct sk_buff *skb, const struct nft_expr *expr)
  54 {
  55         struct nft_dup_ipv6 *priv = nft_expr_priv(expr);
  56 
  57         if (nft_dump_register(skb, NFTA_DUP_SREG_ADDR, priv->sreg_addr))
  58                 goto nla_put_failure;
  59         if (priv->sreg_dev &&
  60             nft_dump_register(skb, NFTA_DUP_SREG_DEV, priv->sreg_dev))
  61                 goto nla_put_failure;
  62 
  63         return 0;
  64 
  65 nla_put_failure:
  66         return -1;
  67 }
  68 
  69 static struct nft_expr_type nft_dup_ipv6_type;
  70 static const struct nft_expr_ops nft_dup_ipv6_ops = {
  71         .type           = &nft_dup_ipv6_type,
  72         .size           = NFT_EXPR_SIZE(sizeof(struct nft_dup_ipv6)),
  73         .eval           = nft_dup_ipv6_eval,
  74         .init           = nft_dup_ipv6_init,
  75         .dump           = nft_dup_ipv6_dump,
  76 };
  77 
  78 static const struct nla_policy nft_dup_ipv6_policy[NFTA_DUP_MAX + 1] = {
  79         [NFTA_DUP_SREG_ADDR]    = { .type = NLA_U32 },
  80         [NFTA_DUP_SREG_DEV]     = { .type = NLA_U32 },
  81 };
  82 
  83 static struct nft_expr_type nft_dup_ipv6_type __read_mostly = {
  84         .family         = NFPROTO_IPV6,
  85         .name           = "dup",
  86         .ops            = &nft_dup_ipv6_ops,
  87         .policy         = nft_dup_ipv6_policy,
  88         .maxattr        = NFTA_DUP_MAX,
  89         .owner          = THIS_MODULE,
  90 };
  91 
  92 static int __init nft_dup_ipv6_module_init(void)
  93 {
  94         return nft_register_expr(&nft_dup_ipv6_type);
  95 }
  96 
  97 static void __exit nft_dup_ipv6_module_exit(void)
  98 {
  99         nft_unregister_expr(&nft_dup_ipv6_type);
 100 }
 101 
 102 module_init(nft_dup_ipv6_module_init);
 103 module_exit(nft_dup_ipv6_module_exit);
 104 
 105 MODULE_LICENSE("GPL");
 106 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
 107 MODULE_ALIAS_NFT_AF_EXPR(AF_INET6, "dup");