LXR linux/net/netfilter/nf_flow_table

   1// SPDX-License-Identifier: GPL-2.0-only
   2#include <linux/kernel.h>
   3#include <linux/init.h>
   4#include <linux/module.h>
   5#include <linux/netfilter.h>
   6#include <linux/rhashtable.h>
   7#include <net/netfilter/nf_flow_table.h>
   8#include <net/netfilter/nf_tables.h>
   9
  10static unsigned int
  11nf_flow_offload_inet_hook(void *priv, struct sk_buff *skb,
  12                          const struct nf_hook_state *state)
  13{
  14        switch (skb->protocol) {
  15        case htons(ETH_P_IP):
  16                return nf_flow_offload_ip_hook(priv, skb, state);
  17        case htons(ETH_P_IPV6):
  18                return nf_flow_offload_ipv6_hook(priv, skb, state);
  19        }
  20
  21        return NF_ACCEPT;
  22}
  23
  24static int nf_flow_rule_route_inet(struct net *net,
  25                                   const struct flow_offload *flow,
  26                                   enum flow_offload_tuple_dir dir,
  27                                   struct nf_flow_rule *flow_rule)
  28{
  29        const struct flow_offload_tuple *flow_tuple = &flow->tuplehash[dir].tuple;
  30        int err;
  31
  32        switch (flow_tuple->l3proto) {
  33        case NFPROTO_IPV4:
  34                err = nf_flow_rule_route_ipv4(net, flow, dir, flow_rule);
  35                break;
  36        case NFPROTO_IPV6:
  37                err = nf_flow_rule_route_ipv6(net, flow, dir, flow_rule);
  38                break;
  39        default:
  40                err = -1;
  41                break;
  42        }
  43
  44        return err;
  45}
  46
  47static struct nf_flowtable_type flowtable_inet = {
  48        .family         = NFPROTO_INET,
  49        .init           = nf_flow_table_init,
  50        .setup          = nf_flow_table_offload_setup,
  51        .action         = nf_flow_rule_route_inet,
  52        .free           = nf_flow_table_free,
  53        .hook           = nf_flow_offload_inet_hook,
  54        .owner          = THIS_MODULE,
  55};
  56
  57static int __init nf_flow_inet_module_init(void)
  58{
  59        nft_register_flowtable_type(&flowtable_inet);
  60
  61        return 0;
  62}
  63
  64static void __exit nf_flow_inet_module_exit(void)
  65{
  66        nft_unregister_flowtable_type(&flowtable_inet);
  67}
  68
  69module_init(nf_flow_inet_module_init);
  70module_exit(nf_flow_inet_module_exit);
  71
  72MODULE_LICENSE("GPL");
  73MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
  74MODULE_ALIAS_NF_FLOWTABLE(1); /* NFPROTO_INET */
  75MODULE_DESCRIPTION("Netfilter flow table mixed IPv4/IPv6 module");
  76