| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org> |
| */ |
| |
| #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_tables_offload.h> |
| #include <net/netfilter/nf_dup_netdev.h> |
| |
| struct nft_dup_netdev { |
| u8 sreg_dev; |
| }; |
| |
| static void nft_dup_netdev_eval(const struct nft_expr *expr, |
| struct nft_regs *regs, |
| const struct nft_pktinfo *pkt) |
| { |
| struct nft_dup_netdev *priv = nft_expr_priv(expr); |
| int oif = regs->data[priv->sreg_dev]; |
| |
| nf_dup_netdev_egress(pkt, oif); |
| } |
| |
| static const struct nla_policy nft_dup_netdev_policy[NFTA_DUP_MAX + 1] = { |
| [NFTA_DUP_SREG_DEV] = { .type = NLA_U32 }, |
| }; |
| |
| static int nft_dup_netdev_init(const struct nft_ctx *ctx, |
| const struct nft_expr *expr, |
| const struct nlattr * const tb[]) |
| { |
| struct nft_dup_netdev *priv = nft_expr_priv(expr); |
| |
| if (tb[NFTA_DUP_SREG_DEV] == NULL) |
| return -EINVAL; |
| |
| return nft_parse_register_load(tb[NFTA_DUP_SREG_DEV], &priv->sreg_dev, |
| sizeof(int)); |
| } |
| |
| static int nft_dup_netdev_dump(struct sk_buff *skb, |
| const struct nft_expr *expr, bool reset) |
| { |
| struct nft_dup_netdev *priv = nft_expr_priv(expr); |
| |
| if (nft_dump_register(skb, NFTA_DUP_SREG_DEV, priv->sreg_dev)) |
| goto nla_put_failure; |
| |
| return 0; |
| |
| nla_put_failure: |
| return -1; |
| } |
| |
| static int nft_dup_netdev_offload(struct nft_offload_ctx *ctx, |
| struct nft_flow_rule *flow, |
| const struct nft_expr *expr) |
| { |
| const struct nft_dup_netdev *priv = nft_expr_priv(expr); |
| int oif = ctx->regs[priv->sreg_dev].data.data[0]; |
| |
| return nft_fwd_dup_netdev_offload(ctx, flow, FLOW_ACTION_MIRRED, oif); |
| } |
| |
| static bool nft_dup_netdev_offload_action(const struct nft_expr *expr) |
| { |
| return true; |
| } |
| |
| static struct nft_expr_type nft_dup_netdev_type; |
| static const struct nft_expr_ops nft_dup_netdev_ops = { |
| .type = &nft_dup_netdev_type, |
| .size = NFT_EXPR_SIZE(sizeof(struct nft_dup_netdev)), |
| .eval = nft_dup_netdev_eval, |
| .init = nft_dup_netdev_init, |
| .dump = nft_dup_netdev_dump, |
| .reduce = NFT_REDUCE_READONLY, |
| .offload = nft_dup_netdev_offload, |
| .offload_action = nft_dup_netdev_offload_action, |
| }; |
| |
| static struct nft_expr_type nft_dup_netdev_type __read_mostly = { |
| .family = NFPROTO_NETDEV, |
| .name = "dup", |
| .ops = &nft_dup_netdev_ops, |
| .policy = nft_dup_netdev_policy, |
| .maxattr = NFTA_DUP_MAX, |
| .owner = THIS_MODULE, |
| }; |
| |
| static int __init nft_dup_netdev_module_init(void) |
| { |
| return nft_register_expr(&nft_dup_netdev_type); |
| } |
| |
| static void __exit nft_dup_netdev_module_exit(void) |
| { |
| nft_unregister_expr(&nft_dup_netdev_type); |
| } |
| |
| module_init(nft_dup_netdev_module_init); |
| module_exit(nft_dup_netdev_module_exit); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); |
| MODULE_ALIAS_NFT_AF_EXPR(5, "dup"); |
| MODULE_DESCRIPTION("nftables netdev packet duplication support"); |