projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 502061f8 PNA |
2 | /* |
| 3 | * Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org> | |
| 502061f8 PNA |
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> | |
| be2861dc | 13 | #include <net/netfilter/nf_tables_offload.h> |
| a32770b1 | 14 | #include <net/netfilter/nf_dup_netdev.h> |
| 502061f8 | 15 | |
| fcd53c51 FW |
16 | #define NF_RECURSION_LIMIT 2 |
| 17 | ||
| 18 | static DEFINE_PER_CPU(u8, nf_dup_skb_recursion); | |
| 19 | ||
| 574a5b85 FW |
20 | static void nf_do_netdev_egress(struct sk_buff *skb, struct net_device *dev, |
| 21 | enum nf_dev_hooks hook) | |
| 3bf32761 | 22 | { |
| fcd53c51 FW |
23 | if (__this_cpu_read(nf_dup_skb_recursion) > NF_RECURSION_LIMIT) |
| 24 | goto err; | |
| 25 | ||
| 574a5b85 | 26 | if (hook == NF_NETDEV_INGRESS && skb_mac_header_was_set(skb)) { |
| fcd53c51 FW |
27 | if (skb_cow_head(skb, skb->mac_len)) |
| 28 | goto err; | |
| 29 | ||
| 3bf32761 | 30 | skb_push(skb, skb->mac_len); |
| 574a5b85 | 31 | } |
| 3bf32761 FW |
32 | |
| 33 | skb->dev = dev; | |
| de799101 | 34 | skb_clear_tstamp(skb); |
| fcd53c51 | 35 | __this_cpu_inc(nf_dup_skb_recursion); |
| 3bf32761 | 36 | dev_queue_xmit(skb); |
| fcd53c51 FW |
37 | __this_cpu_dec(nf_dup_skb_recursion); |
| 38 | return; | |
| 39 | err: | |
| 40 | kfree_skb(skb); | |
| 3bf32761 FW |
41 | } |
| 42 | ||
| 43 | void nf_fwd_netdev_egress(const struct nft_pktinfo *pkt, int oif) | |
| 44 | { | |
| 45 | struct net_device *dev; | |
| 46 | ||
| 47 | dev = dev_get_by_index_rcu(nft_net(pkt), oif); | |
| 48 | if (!dev) { | |
| 49 | kfree_skb(pkt->skb); | |
| 50 | return; | |
| 51 | } | |
| 52 | ||
| 574a5b85 | 53 | nf_do_netdev_egress(pkt->skb, dev, nft_hook(pkt)); |
| 3bf32761 FW |
54 | } |
| 55 | EXPORT_SYMBOL_GPL(nf_fwd_netdev_egress); | |
| 56 | ||
| 502061f8 PNA |
57 | void nf_dup_netdev_egress(const struct nft_pktinfo *pkt, int oif) |
| 58 | { | |
| 59 | struct net_device *dev; | |
| 60 | struct sk_buff *skb; | |
| 61 | ||
| 0e5a1c7e | 62 | dev = dev_get_by_index_rcu(nft_net(pkt), oif); |
| 502061f8 PNA |
63 | if (dev == NULL) |
| 64 | return; | |
| 65 | ||
| 66 | skb = skb_clone(pkt->skb, GFP_ATOMIC); | |
| 3bf32761 | 67 | if (skb) |
| 574a5b85 | 68 | nf_do_netdev_egress(skb, dev, nft_hook(pkt)); |
| 502061f8 PNA |
69 | } |
| 70 | EXPORT_SYMBOL_GPL(nf_dup_netdev_egress); | |
| 71 | ||
| be2861dc PNA |
72 | int nft_fwd_dup_netdev_offload(struct nft_offload_ctx *ctx, |
| 73 | struct nft_flow_rule *flow, | |
| 74 | enum flow_action_id id, int oif) | |
| 75 | { | |
| 76 | struct flow_action_entry *entry; | |
| 77 | struct net_device *dev; | |
| 78 | ||
| 79 | /* nft_flow_rule_destroy() releases the reference on this device. */ | |
| 80 | dev = dev_get_by_index(ctx->net, oif); | |
| 81 | if (!dev) | |
| 82 | return -EOPNOTSUPP; | |
| 83 | ||
| 84 | entry = &flow->rule->action.entries[ctx->num_actions++]; | |
| 85 | entry->id = id; | |
| 86 | entry->dev = dev; | |
| 87 | ||
| 88 | return 0; | |
| 89 | } | |
| 90 | EXPORT_SYMBOL_GPL(nft_fwd_dup_netdev_offload); | |
| 91 | ||
| 502061f8 PNA |
92 | MODULE_LICENSE("GPL"); |
| 93 | MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); | |
| 4cacc395 | 94 | MODULE_DESCRIPTION("Netfilter packet duplication support"); |