1 /* 2 * Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org> 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 as published by 6 * the Free Software Foundation. 7 */ 8 9 #include <linux/kernel.h> 10 #include <linux/init.h> 11 #include <linux/module.h> 12 #include <linux/netlink.h> 13 #include <linux/netfilter.h> 14 #include <linux/netfilter/nf_tables.h> 15 #include <net/netfilter/nf_tables.h> 16 #include <net/netfilter/nf_dup_netdev.h> 17 18 struct nft_dup_netdev { 19 enum nft_registers sreg_dev:8; 20 }; 21 22 static void nft_dup_netdev_eval(const struct nft_expr *expr, 23 struct nft_regs *regs, 24 const struct nft_pktinfo *pkt) 25 { 26 struct nft_dup_netdev *priv = nft_expr_priv(expr); 27 int oif = regs->data[priv->sreg_dev]; 28 29 nf_dup_netdev_egress(pkt, oif); 30 } 31 32 static const struct nla_policy nft_dup_netdev_policy[NFTA_DUP_MAX + 1] = { 33 [NFTA_DUP_SREG_DEV] = { .type = NLA_U32 }, 34 }; 35 36 static int nft_dup_netdev_init(const struct nft_ctx *ctx, 37 const struct nft_expr *expr, 38 const struct nlattr * const tb[]) 39 { 40 struct nft_dup_netdev *priv = nft_expr_priv(expr); 41 42 if (tb[NFTA_DUP_SREG_DEV] == NULL) 43 return -EINVAL; 44 45 priv->sreg_dev = nft_parse_register(tb[NFTA_DUP_SREG_DEV]); 46 return nft_validate_register_load(priv->sreg_dev, sizeof(int)); 47 } 48 49 static int nft_dup_netdev_dump(struct sk_buff *skb, const struct nft_expr *expr) 50 { 51 struct nft_dup_netdev *priv = nft_expr_priv(expr); 52 53 if (nft_dump_register(skb, NFTA_DUP_SREG_DEV, priv->sreg_dev)) 54 goto nla_put_failure; 55 56 return 0; 57 58 nla_put_failure: 59 return -1; 60 } 61 62 static struct nft_expr_type nft_dup_netdev_type; 63 static const struct nft_expr_ops nft_dup_netdev_ops = { 64 .type = &nft_dup_netdev_type, 65 .size = NFT_EXPR_SIZE(sizeof(struct nft_dup_netdev)), 66 .eval = nft_dup_netdev_eval, 67 .init = nft_dup_netdev_init, 68 .dump = nft_dup_netdev_dump, 69 }; 70 71 static struct nft_expr_type nft_dup_netdev_type __read_mostly = { 72 .family = NFPROTO_NETDEV, 73 .name = "dup", 74 .ops = &nft_dup_netdev_ops, 75 .policy = nft_dup_netdev_policy, 76 .maxattr = NFTA_DUP_MAX, 77 .owner = THIS_MODULE, 78 }; 79 80 static int __init nft_dup_netdev_module_init(void) 81 { 82 return nft_register_expr(&nft_dup_netdev_type); 83 } 84 85 static void __exit nft_dup_netdev_module_exit(void) 86 { 87 nft_unregister_expr(&nft_dup_netdev_type); 88 } 89 90 module_init(nft_dup_netdev_module_init); 91 module_exit(nft_dup_netdev_module_exit); 92 93 MODULE_LICENSE("GPL"); 94 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); 95 MODULE_ALIAS_NFT_AF_EXPR(5, "dup"); 96