swh:1:snp:173f8deb0c56c557784b4fd217e7608ac6197844
Tip revision: e42617b825f8073569da76dc4510bfa019b1c35a authored by Linus Torvalds on 08 December 2019, 22:57:55 UTC
Linux 5.5-rc1
Linux 5.5-rc1
Tip revision: e42617b
nft_dup_netdev.c
// 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 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,
};
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");