net/netfilter/nft_fib_netdev.c

   1 /*
   2  * Copyright (c) 2017 Pablo M. Bermudo Garay <pablombg@gmail.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  * This code is based on net/netfilter/nft_fib_inet.c, written by
   9  * Florian Westphal <fw@strlen.de>.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/init.h>
  14 #include <linux/module.h>
  15 #include <linux/netlink.h>
  16 #include <linux/netfilter.h>
  17 #include <linux/netfilter/nf_tables.h>
  18 #include <net/netfilter/nf_tables_core.h>
  19 #include <net/netfilter/nf_tables.h>
  20
  21 #include <net/netfilter/nft_fib.h>
  22
  23 static void nft_fib_netdev_eval(const struct nft_expr *expr,
  24                                 struct nft_regs *regs,
  25                                 const struct nft_pktinfo *pkt)
  26 {
  27         const struct nft_fib *priv = nft_expr_priv(expr);
  28
  29         switch (ntohs(pkt->skb->protocol)) {
  30         case ETH_P_IP:
  31                 switch (priv->result) {
  32                 case NFT_FIB_RESULT_OIF:
  33                 case NFT_FIB_RESULT_OIFNAME:
  34                         return nft_fib4_eval(expr, regs, pkt);
  35                 case NFT_FIB_RESULT_ADDRTYPE:
  36                         return nft_fib4_eval_type(expr, regs, pkt);
  37                 }
  38                 break;
  39         case ETH_P_IPV6:
  40                 switch (priv->result) {
  41                 case NFT_FIB_RESULT_OIF:
  42                 case NFT_FIB_RESULT_OIFNAME:
  43                         return nft_fib6_eval(expr, regs, pkt);
  44                 case NFT_FIB_RESULT_ADDRTYPE:
  45                         return nft_fib6_eval_type(expr, regs, pkt);
  46                 }
  47                 break;
  48         }
  49
  50         regs->verdict.code = NFT_BREAK;
  51 }
  52
  53 static struct nft_expr_type nft_fib_netdev_type;
  54 static const struct nft_expr_ops nft_fib_netdev_ops = {
  55         .type           = &nft_fib_netdev_type,
  56         .size           = NFT_EXPR_SIZE(sizeof(struct nft_fib)),
  57         .eval           = nft_fib_netdev_eval,
  58         .init           = nft_fib_init,
  59         .dump           = nft_fib_dump,
  60         .validate       = nft_fib_validate,
  61 };
  62
  63 static struct nft_expr_type nft_fib_netdev_type __read_mostly = {
  64         .family         = NFPROTO_NETDEV,
  65         .name           = "fib",
  66         .ops            = &nft_fib_netdev_ops,
  67         .policy         = nft_fib_policy,
  68         .maxattr        = NFTA_FIB_MAX,
  69         .owner          = THIS_MODULE,
  70 };
  71
  72 static int __init nft_fib_netdev_module_init(void)
  73 {
  74         return nft_register_expr(&nft_fib_netdev_type);
  75 }
  76
  77 static void __exit nft_fib_netdev_module_exit(void)
  78 {
  79         nft_unregister_expr(&nft_fib_netdev_type);
  80 }
  81
  82 module_init(nft_fib_netdev_module_init);
  83 module_exit(nft_fib_netdev_module_exit);
  84
  85 MODULE_LICENSE("GPL");
  86 MODULE_AUTHOR("Pablo M. Bermudo Garay <pablombg@gmail.com>");
  87 MODULE_ALIAS_NFT_AF_EXPR(5, "fib");