| /* |
| * Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org> |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 as published by |
| * the Free Software Foundation. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/module.h> |
| #include <linux/netlink.h> |
| #include <linux/netfilter.h> |
| #include <linux/netfilter/nf_tables.h> |
| #include <net/netfilter/nf_tables.h> |
| #include <net/netfilter/nf_dup_netdev.h> |
| |
| struct nft_fwd_netdev { |
| enum nft_registers sreg_dev:8; |
| }; |
| |
| static void nft_fwd_netdev_eval(const struct nft_expr *expr, |
| struct nft_regs *regs, |
| const struct nft_pktinfo *pkt) |
| { |
| struct nft_fwd_netdev *priv = nft_expr_priv(expr); |
| int oif = regs->data[priv->sreg_dev]; |
| |
| nf_fwd_netdev_egress(pkt, oif); |
| regs->verdict.code = NF_STOLEN; |
| } |
| |
| static const struct nla_policy nft_fwd_netdev_policy[NFTA_FWD_MAX + 1] = { |
| [NFTA_FWD_SREG_DEV] = { .type = NLA_U32 }, |
| }; |
| |
| static int nft_fwd_netdev_init(const struct nft_ctx *ctx, |
| const struct nft_expr *expr, |
| const struct nlattr * const tb[]) |
| { |
| struct nft_fwd_netdev *priv = nft_expr_priv(expr); |
| |
| if (tb[NFTA_FWD_SREG_DEV] == NULL) |
| return -EINVAL; |
| |
| priv->sreg_dev = nft_parse_register(tb[NFTA_FWD_SREG_DEV]); |
| return nft_validate_register_load(priv->sreg_dev, sizeof(int)); |
| } |
| |
| static const struct nft_expr_ops nft_fwd_netdev_ingress_ops; |
| |
| static int nft_fwd_netdev_dump(struct sk_buff *skb, const struct nft_expr *expr) |
| { |
| struct nft_fwd_netdev *priv = nft_expr_priv(expr); |
| |
| if (nft_dump_register(skb, NFTA_FWD_SREG_DEV, priv->sreg_dev)) |
| goto nla_put_failure; |
| |
| return 0; |
| |
| nla_put_failure: |
| return -1; |
| } |
| |
| static struct nft_expr_type nft_fwd_netdev_type; |
| static const struct nft_expr_ops nft_fwd_netdev_ops = { |
| .type = &nft_fwd_netdev_type, |
| .size = NFT_EXPR_SIZE(sizeof(struct nft_fwd_netdev)), |
| .eval = nft_fwd_netdev_eval, |
| .init = nft_fwd_netdev_init, |
| .dump = nft_fwd_netdev_dump, |
| }; |
| |
| static struct nft_expr_type nft_fwd_netdev_type __read_mostly = { |
| .family = NFPROTO_NETDEV, |
| .name = "fwd", |
| .ops = &nft_fwd_netdev_ops, |
| .policy = nft_fwd_netdev_policy, |
| .maxattr = NFTA_FWD_MAX, |
| .owner = THIS_MODULE, |
| }; |
| |
| static int __init nft_fwd_netdev_module_init(void) |
| { |
| return nft_register_expr(&nft_fwd_netdev_type); |
| } |
| |
| static void __exit nft_fwd_netdev_module_exit(void) |
| { |
| nft_unregister_expr(&nft_fwd_netdev_type); |
| } |
| |
| module_init(nft_fwd_netdev_module_init); |
| module_exit(nft_fwd_netdev_module_exit); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); |
| MODULE_ALIAS_NFT_AF_EXPR(5, "fwd"); |