root/net/netfilter/nf_dup_netdev.c

DEFINITIONS

1. nf_do_netdev_egress
2. nf_fwd_netdev_egress
3. nf_dup_netdev_egress
4. nft_fwd_dup_netdev_offload

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org>
   4  */
   5 
   6 #include <linux/kernel.h>
   7 #include <linux/init.h>
   8 #include <linux/module.h>
   9 #include <linux/netlink.h>
  10 #include <linux/netfilter.h>
  11 #include <linux/netfilter/nf_tables.h>
  12 #include <net/netfilter/nf_tables.h>
  13 #include <net/netfilter/nf_tables_offload.h>
  14 #include <net/netfilter/nf_dup_netdev.h>
  15 
  16 static void nf_do_netdev_egress(struct sk_buff *skb, struct net_device *dev)
  17 {
  18         if (skb_mac_header_was_set(skb))
  19                 skb_push(skb, skb->mac_len);
  20 
  21         skb->dev = dev;
  22         dev_queue_xmit(skb);
  23 }
  24 
  25 void nf_fwd_netdev_egress(const struct nft_pktinfo *pkt, int oif)
  26 {
  27         struct net_device *dev;
  28 
  29         dev = dev_get_by_index_rcu(nft_net(pkt), oif);
  30         if (!dev) {
  31                 kfree_skb(pkt->skb);
  32                 return;
  33         }
  34 
  35         nf_do_netdev_egress(pkt->skb, dev);
  36 }
  37 EXPORT_SYMBOL_GPL(nf_fwd_netdev_egress);
  38 
  39 void nf_dup_netdev_egress(const struct nft_pktinfo *pkt, int oif)
  40 {
  41         struct net_device *dev;
  42         struct sk_buff *skb;
  43 
  44         dev = dev_get_by_index_rcu(nft_net(pkt), oif);
  45         if (dev == NULL)
  46                 return;
  47 
  48         skb = skb_clone(pkt->skb, GFP_ATOMIC);
  49         if (skb)
  50                 nf_do_netdev_egress(skb, dev);
  51 }
  52 EXPORT_SYMBOL_GPL(nf_dup_netdev_egress);
  53 
  54 int nft_fwd_dup_netdev_offload(struct nft_offload_ctx *ctx,
  55                                struct nft_flow_rule *flow,
  56                                enum flow_action_id id, int oif)
  57 {
  58         struct flow_action_entry *entry;
  59         struct net_device *dev;
  60 
  61         /* nft_flow_rule_destroy() releases the reference on this device. */
  62         dev = dev_get_by_index(ctx->net, oif);
  63         if (!dev)
  64                 return -EOPNOTSUPP;
  65 
  66         entry = &flow->rule->action.entries[ctx->num_actions++];
  67         entry->id = id;
  68         entry->dev = dev;
  69 
  70         return 0;
  71 }
  72 EXPORT_SYMBOL_GPL(nft_fwd_dup_netdev_offload);
  73 
  74 MODULE_LICENSE("GPL");
  75 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");