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- // 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 {
- enum nft_registers sreg_dev:8;
- };
- 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;
- priv->sreg_dev = nft_parse_register(tb[NFTA_DUP_SREG_DEV]);
- return nft_validate_register_load(priv->sreg_dev, sizeof(int));
- }
- static int nft_dup_netdev_dump(struct sk_buff *skb, const struct nft_expr *expr)
- {
- 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,
- .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");
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