net/netfilter/nf_dup_netdev.c

   1 /*
   2  * Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org>
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 as published by
   6  * the Free Software Foundation.
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/init.h>
  11 #include <linux/module.h>
  12 #include <linux/netlink.h>
  13 #include <linux/netfilter.h>
  14 #include <linux/netfilter/nf_tables.h>
  15 #include <net/netfilter/nf_tables.h>
  16
  17 void nf_dup_netdev_egress(const struct nft_pktinfo *pkt, int oif)
  18 {
  19         struct net_device *dev;
  20         struct sk_buff *skb;
  21
  22         dev = dev_get_by_index_rcu(pkt->net, oif);
  23         if (dev == NULL)
  24                 return;
  25
  26         skb = skb_clone(pkt->skb, GFP_ATOMIC);
  27         if (skb == NULL)
  28                 return;
  29
  30         if (skb_mac_header_was_set(skb))
  31                 skb_push(skb, skb->mac_len);
  32
  33         skb->dev = dev;
  34         dev_queue_xmit(skb);
  35 }
  36 EXPORT_SYMBOL_GPL(nf_dup_netdev_egress);
  37
  38 MODULE_LICENSE("GPL");
  39 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");