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"); 88