Pablo Neira Ayuso | 39e6dea | 2015-11-25 13:39:38 +0100 | [diff] [blame] | 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_fwd_netdev { |
| 19 | enum nft_registers sreg_dev:8; |
| 20 | }; |
| 21 | |
| 22 | static void nft_fwd_netdev_eval(const struct nft_expr *expr, |
| 23 | struct nft_regs *regs, |
| 24 | const struct nft_pktinfo *pkt) |
| 25 | { |
| 26 | struct nft_fwd_netdev *priv = nft_expr_priv(expr); |
| 27 | int oif = regs->data[priv->sreg_dev]; |
| 28 | |
| 29 | nf_dup_netdev_egress(pkt, oif); |
| 30 | regs->verdict.code = NF_DROP; |
| 31 | } |
| 32 | |
| 33 | static const struct nla_policy nft_fwd_netdev_policy[NFTA_FWD_MAX + 1] = { |
| 34 | [NFTA_FWD_SREG_DEV] = { .type = NLA_U32 }, |
| 35 | }; |
| 36 | |
| 37 | static int nft_fwd_netdev_init(const struct nft_ctx *ctx, |
| 38 | const struct nft_expr *expr, |
| 39 | const struct nlattr * const tb[]) |
| 40 | { |
| 41 | struct nft_fwd_netdev *priv = nft_expr_priv(expr); |
| 42 | |
| 43 | if (tb[NFTA_FWD_SREG_DEV] == NULL) |
| 44 | return -EINVAL; |
| 45 | |
| 46 | priv->sreg_dev = nft_parse_register(tb[NFTA_FWD_SREG_DEV]); |
| 47 | return nft_validate_register_load(priv->sreg_dev, sizeof(int)); |
| 48 | } |
| 49 | |
| 50 | static const struct nft_expr_ops nft_fwd_netdev_ingress_ops; |
| 51 | |
| 52 | static int nft_fwd_netdev_dump(struct sk_buff *skb, const struct nft_expr *expr) |
| 53 | { |
| 54 | struct nft_fwd_netdev *priv = nft_expr_priv(expr); |
| 55 | |
| 56 | if (nft_dump_register(skb, NFTA_FWD_SREG_DEV, priv->sreg_dev)) |
| 57 | goto nla_put_failure; |
| 58 | |
| 59 | return 0; |
| 60 | |
| 61 | nla_put_failure: |
| 62 | return -1; |
| 63 | } |
| 64 | |
Pablo Neira Ayuso | 282fd1f | 2020-03-23 14:27:16 +0100 | [diff] [blame^] | 65 | static int nft_fwd_validate(const struct nft_ctx *ctx, |
| 66 | const struct nft_expr *expr, |
| 67 | const struct nft_data **data) |
| 68 | { |
| 69 | return nft_chain_validate_hooks(ctx->chain, (1 << NF_NETDEV_INGRESS)); |
| 70 | } |
| 71 | |
Pablo Neira Ayuso | 39e6dea | 2015-11-25 13:39:38 +0100 | [diff] [blame] | 72 | static struct nft_expr_type nft_fwd_netdev_type; |
| 73 | static const struct nft_expr_ops nft_fwd_netdev_ops = { |
| 74 | .type = &nft_fwd_netdev_type, |
| 75 | .size = NFT_EXPR_SIZE(sizeof(struct nft_fwd_netdev)), |
| 76 | .eval = nft_fwd_netdev_eval, |
| 77 | .init = nft_fwd_netdev_init, |
| 78 | .dump = nft_fwd_netdev_dump, |
Pablo Neira Ayuso | 282fd1f | 2020-03-23 14:27:16 +0100 | [diff] [blame^] | 79 | .validate = nft_fwd_validate, |
Pablo Neira Ayuso | 39e6dea | 2015-11-25 13:39:38 +0100 | [diff] [blame] | 80 | }; |
| 81 | |
| 82 | static struct nft_expr_type nft_fwd_netdev_type __read_mostly = { |
| 83 | .family = NFPROTO_NETDEV, |
| 84 | .name = "fwd", |
| 85 | .ops = &nft_fwd_netdev_ops, |
| 86 | .policy = nft_fwd_netdev_policy, |
| 87 | .maxattr = NFTA_FWD_MAX, |
| 88 | .owner = THIS_MODULE, |
| 89 | }; |
| 90 | |
| 91 | static int __init nft_fwd_netdev_module_init(void) |
| 92 | { |
| 93 | return nft_register_expr(&nft_fwd_netdev_type); |
| 94 | } |
| 95 | |
| 96 | static void __exit nft_fwd_netdev_module_exit(void) |
| 97 | { |
| 98 | nft_unregister_expr(&nft_fwd_netdev_type); |
| 99 | } |
| 100 | |
| 101 | module_init(nft_fwd_netdev_module_init); |
| 102 | module_exit(nft_fwd_netdev_module_exit); |
| 103 | |
| 104 | MODULE_LICENSE("GPL"); |
| 105 | MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); |
| 106 | MODULE_ALIAS_NFT_AF_EXPR(5, "fwd"); |