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Linux/net/netfilter/nf_dup_netdev.c

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  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 #include <net/netfilter/nf_dup_netdev.h>
 17 
 18 static void nf_do_netdev_egress(struct sk_buff *skb, struct net_device *dev)
 19 {
 20         if (skb_mac_header_was_set(skb))
 21                 skb_push(skb, skb->mac_len);
 22 
 23         skb->dev = dev;
 24         dev_queue_xmit(skb);
 25 }
 26 
 27 void nf_fwd_netdev_egress(const struct nft_pktinfo *pkt, int oif)
 28 {
 29         struct net_device *dev;
 30 
 31         dev = dev_get_by_index_rcu(nft_net(pkt), oif);
 32         if (!dev) {
 33                 kfree_skb(pkt->skb);
 34                 return;
 35         }
 36 
 37         nf_do_netdev_egress(pkt->skb, dev);
 38 }
 39 EXPORT_SYMBOL_GPL(nf_fwd_netdev_egress);
 40 
 41 void nf_dup_netdev_egress(const struct nft_pktinfo *pkt, int oif)
 42 {
 43         struct net_device *dev;
 44         struct sk_buff *skb;
 45 
 46         dev = dev_get_by_index_rcu(nft_net(pkt), oif);
 47         if (dev == NULL)
 48                 return;
 49 
 50         skb = skb_clone(pkt->skb, GFP_ATOMIC);
 51         if (skb)
 52                 nf_do_netdev_egress(skb, dev);
 53 }
 54 EXPORT_SYMBOL_GPL(nf_dup_netdev_egress);
 55 
 56 MODULE_LICENSE("GPL");
 57 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
 58 

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