Contributors: 7
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Pablo Neira Ayuso |
259 |
60.09% |
7 |
46.67% |
| Florian Westphal |
103 |
23.90% |
3 |
20.00% |
| Sebastian Andrzej Siewior |
56 |
12.99% |
1 |
6.67% |
| Rob Gill |
5 |
1.16% |
1 |
6.67% |
| Martin KaFai Lau |
3 |
0.70% |
1 |
6.67% |
| Stephen Hemminger |
3 |
0.70% |
1 |
6.67% |
| Thomas Gleixner |
2 |
0.46% |
1 |
6.67% |
| Total |
431 |
|
15 |
|
// 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>
#define NF_RECURSION_LIMIT 2
#ifndef CONFIG_PREEMPT_RT
static u8 *nf_get_nf_dup_skb_recursion(void)
{
return this_cpu_ptr(&softnet_data.xmit.nf_dup_skb_recursion);
}
#else
static u8 *nf_get_nf_dup_skb_recursion(void)
{
return ¤t->net_xmit.nf_dup_skb_recursion;
}
#endif
static void nf_do_netdev_egress(struct sk_buff *skb, struct net_device *dev,
enum nf_dev_hooks hook)
{
u8 *nf_dup_skb_recursion = nf_get_nf_dup_skb_recursion();
if (*nf_dup_skb_recursion > NF_RECURSION_LIMIT)
goto err;
if (hook == NF_NETDEV_INGRESS && skb_mac_header_was_set(skb)) {
if (skb_cow_head(skb, skb->mac_len))
goto err;
skb_push(skb, skb->mac_len);
}
skb->dev = dev;
skb_clear_tstamp(skb);
(*nf_dup_skb_recursion)++;
dev_queue_xmit(skb);
(*nf_dup_skb_recursion)--;
return;
err:
kfree_skb(skb);
}
void nf_fwd_netdev_egress(const struct nft_pktinfo *pkt, int oif)
{
struct net_device *dev;
dev = dev_get_by_index_rcu(nft_net(pkt), oif);
if (!dev) {
kfree_skb(pkt->skb);
return;
}
nf_do_netdev_egress(pkt->skb, dev, nft_hook(pkt));
}
EXPORT_SYMBOL_GPL(nf_fwd_netdev_egress);
void nf_dup_netdev_egress(const struct nft_pktinfo *pkt, int oif)
{
struct net_device *dev;
struct sk_buff *skb;
dev = dev_get_by_index_rcu(nft_net(pkt), oif);
if (dev == NULL)
return;
skb = skb_clone(pkt->skb, GFP_ATOMIC);
if (skb)
nf_do_netdev_egress(skb, dev, nft_hook(pkt));
}
EXPORT_SYMBOL_GPL(nf_dup_netdev_egress);
int nft_fwd_dup_netdev_offload(struct nft_offload_ctx *ctx,
struct nft_flow_rule *flow,
enum flow_action_id id, int oif)
{
struct flow_action_entry *entry;
struct net_device *dev;
/* nft_flow_rule_destroy() releases the reference on this device. */
dev = dev_get_by_index(ctx->net, oif);
if (!dev)
return -EOPNOTSUPP;
entry = &flow->rule->action.entries[ctx->num_actions++];
entry->id = id;
entry->dev = dev;
return 0;
}
EXPORT_SYMBOL_GPL(nft_fwd_dup_netdev_offload);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
MODULE_DESCRIPTION("Netfilter packet duplication support");