mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![Weongyo Jeong](/assets/img/avatar_default.png)
nft_dup_netdev_ingress_ops and nft_fwd_netdev_ingress_ops variables are no longer used at the code. Signed-off-by: Weongyo Jeong <weongyo.linux@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
238 lines
5.8 KiB
C
238 lines
5.8 KiB
C
/*
|
|
* 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 <linux/ip.h>
|
|
#include <linux/ipv6.h>
|
|
#include <net/netfilter/nf_tables.h>
|
|
#include <net/netfilter/nf_dup_netdev.h>
|
|
#include <net/neighbour.h>
|
|
#include <net/ip.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 },
|
|
[NFTA_FWD_SREG_ADDR] = { .type = NLA_U32 },
|
|
[NFTA_FWD_NFPROTO] = { .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 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;
|
|
}
|
|
|
|
struct nft_fwd_neigh {
|
|
enum nft_registers sreg_dev:8;
|
|
enum nft_registers sreg_addr:8;
|
|
u8 nfproto;
|
|
};
|
|
|
|
static void nft_fwd_neigh_eval(const struct nft_expr *expr,
|
|
struct nft_regs *regs,
|
|
const struct nft_pktinfo *pkt)
|
|
{
|
|
struct nft_fwd_neigh *priv = nft_expr_priv(expr);
|
|
void *addr = ®s->data[priv->sreg_addr];
|
|
int oif = regs->data[priv->sreg_dev];
|
|
unsigned int verdict = NF_STOLEN;
|
|
struct sk_buff *skb = pkt->skb;
|
|
struct net_device *dev;
|
|
int neigh_table;
|
|
|
|
switch (priv->nfproto) {
|
|
case NFPROTO_IPV4: {
|
|
struct iphdr *iph;
|
|
|
|
if (skb->protocol != htons(ETH_P_IP)) {
|
|
verdict = NFT_BREAK;
|
|
goto out;
|
|
}
|
|
if (skb_try_make_writable(skb, sizeof(*iph))) {
|
|
verdict = NF_DROP;
|
|
goto out;
|
|
}
|
|
iph = ip_hdr(skb);
|
|
ip_decrease_ttl(iph);
|
|
neigh_table = NEIGH_ARP_TABLE;
|
|
break;
|
|
}
|
|
case NFPROTO_IPV6: {
|
|
struct ipv6hdr *ip6h;
|
|
|
|
if (skb->protocol != htons(ETH_P_IPV6)) {
|
|
verdict = NFT_BREAK;
|
|
goto out;
|
|
}
|
|
if (skb_try_make_writable(skb, sizeof(*ip6h))) {
|
|
verdict = NF_DROP;
|
|
goto out;
|
|
}
|
|
ip6h = ipv6_hdr(skb);
|
|
ip6h->hop_limit--;
|
|
neigh_table = NEIGH_ND_TABLE;
|
|
break;
|
|
}
|
|
default:
|
|
verdict = NFT_BREAK;
|
|
goto out;
|
|
}
|
|
|
|
dev = dev_get_by_index_rcu(nft_net(pkt), oif);
|
|
if (dev == NULL)
|
|
return;
|
|
|
|
skb->dev = dev;
|
|
neigh_xmit(neigh_table, dev, addr, skb);
|
|
out:
|
|
regs->verdict.code = verdict;
|
|
}
|
|
|
|
static int nft_fwd_neigh_init(const struct nft_ctx *ctx,
|
|
const struct nft_expr *expr,
|
|
const struct nlattr * const tb[])
|
|
{
|
|
struct nft_fwd_neigh *priv = nft_expr_priv(expr);
|
|
unsigned int addr_len;
|
|
int err;
|
|
|
|
if (!tb[NFTA_FWD_SREG_DEV] ||
|
|
!tb[NFTA_FWD_SREG_ADDR] ||
|
|
!tb[NFTA_FWD_NFPROTO])
|
|
return -EINVAL;
|
|
|
|
priv->sreg_dev = nft_parse_register(tb[NFTA_FWD_SREG_DEV]);
|
|
priv->sreg_addr = nft_parse_register(tb[NFTA_FWD_SREG_ADDR]);
|
|
priv->nfproto = ntohl(nla_get_be32(tb[NFTA_FWD_NFPROTO]));
|
|
|
|
switch (priv->nfproto) {
|
|
case NFPROTO_IPV4:
|
|
addr_len = sizeof(struct in_addr);
|
|
break;
|
|
case NFPROTO_IPV6:
|
|
addr_len = sizeof(struct in6_addr);
|
|
break;
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
err = nft_validate_register_load(priv->sreg_dev, sizeof(int));
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return nft_validate_register_load(priv->sreg_addr, addr_len);
|
|
}
|
|
|
|
static int nft_fwd_neigh_dump(struct sk_buff *skb, const struct nft_expr *expr)
|
|
{
|
|
struct nft_fwd_neigh *priv = nft_expr_priv(expr);
|
|
|
|
if (nft_dump_register(skb, NFTA_FWD_SREG_DEV, priv->sreg_dev) ||
|
|
nft_dump_register(skb, NFTA_FWD_SREG_ADDR, priv->sreg_addr) ||
|
|
nla_put_be32(skb, NFTA_FWD_NFPROTO, htonl(priv->nfproto)))
|
|
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_neigh_netdev_ops = {
|
|
.type = &nft_fwd_netdev_type,
|
|
.size = NFT_EXPR_SIZE(sizeof(struct nft_fwd_neigh)),
|
|
.eval = nft_fwd_neigh_eval,
|
|
.init = nft_fwd_neigh_init,
|
|
.dump = nft_fwd_neigh_dump,
|
|
};
|
|
|
|
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 const struct nft_expr_ops *
|
|
nft_fwd_select_ops(const struct nft_ctx *ctx,
|
|
const struct nlattr * const tb[])
|
|
{
|
|
if (tb[NFTA_FWD_SREG_ADDR])
|
|
return &nft_fwd_neigh_netdev_ops;
|
|
if (tb[NFTA_FWD_SREG_DEV])
|
|
return &nft_fwd_netdev_ops;
|
|
|
|
return ERR_PTR(-EOPNOTSUPP);
|
|
}
|
|
|
|
static struct nft_expr_type nft_fwd_netdev_type __read_mostly = {
|
|
.family = NFPROTO_NETDEV,
|
|
.name = "fwd",
|
|
.select_ops = nft_fwd_select_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");
|