// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/netfilter.h>
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#include <linux/rhashtable.h>
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#include <net/netfilter/nf_flow_table.h>
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#include <net/netfilter/nf_tables.h>
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static unsigned int
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nf_flow_offload_inet_hook(void *priv, struct sk_buff *skb,
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const struct nf_hook_state *state)
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{
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switch (skb->protocol) {
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case htons(ETH_P_IP):
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return nf_flow_offload_ip_hook(priv, skb, state);
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case htons(ETH_P_IPV6):
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return nf_flow_offload_ipv6_hook(priv, skb, state);
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}
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return NF_ACCEPT;
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}
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static int nf_flow_rule_route_inet(struct net *net,
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const struct flow_offload *flow,
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enum flow_offload_tuple_dir dir,
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struct nf_flow_rule *flow_rule)
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{
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const struct flow_offload_tuple *flow_tuple = &flow->tuplehash[dir].tuple;
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int err;
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switch (flow_tuple->l3proto) {
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case NFPROTO_IPV4:
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err = nf_flow_rule_route_ipv4(net, flow, dir, flow_rule);
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break;
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case NFPROTO_IPV6:
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err = nf_flow_rule_route_ipv6(net, flow, dir, flow_rule);
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break;
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default:
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err = -1;
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break;
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}
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return err;
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}
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static struct nf_flowtable_type flowtable_inet = {
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.family = NFPROTO_INET,
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.init = nf_flow_table_init,
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.setup = nf_flow_table_offload_setup,
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.action = nf_flow_rule_route_inet,
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.free = nf_flow_table_free,
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.hook = nf_flow_offload_inet_hook,
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.owner = THIS_MODULE,
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};
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static int __init nf_flow_inet_module_init(void)
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{
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nft_register_flowtable_type(&flowtable_inet);
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return 0;
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}
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static void __exit nf_flow_inet_module_exit(void)
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{
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nft_unregister_flowtable_type(&flowtable_inet);
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}
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module_init(nf_flow_inet_module_init);
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module_exit(nf_flow_inet_module_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
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MODULE_ALIAS_NF_FLOWTABLE(1); /* NFPROTO_INET */
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MODULE_DESCRIPTION("Netfilter flow table mixed IPv4/IPv6 module");
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