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 #include <linux/if_vlan.h> 10 11 static unsigned int 12 nf_flow_offload_inet_hook(void *priv, struct sk_buff *skb, 13 const struct nf_hook_state *state) 14 { 15 struct vlan_ethhdr *veth; 16 __be16 proto; 17 18 switch (skb->protocol) { 19 case htons(ETH_P_8021Q): 20 veth = (struct vlan_ethhdr *)skb_mac_header(skb); 21 proto = veth->h_vlan_encapsulated_proto; 22 break; 23 case htons(ETH_P_PPP_SES): 24 proto = nf_flow_pppoe_proto(skb); 25 break; 26 default: 27 proto = skb->protocol; 28 break; 29 } 30 31 switch (proto) { 32 case htons(ETH_P_IP): 33 return nf_flow_offload_ip_hook(priv, skb, state); 34 case htons(ETH_P_IPV6): 35 return nf_flow_offload_ipv6_hook(priv, skb, state); 36 } 37 38 return NF_ACCEPT; 39 } 40 41 static int nf_flow_rule_route_inet(struct net *net, 42 struct flow_offload *flow, 43 enum flow_offload_tuple_dir dir, 44 struct nf_flow_rule *flow_rule) 45 { 46 const struct flow_offload_tuple *flow_tuple = &flow->tuplehash[dir].tuple; 47 int err; 48 49 switch (flow_tuple->l3proto) { 50 case NFPROTO_IPV4: 51 err = nf_flow_rule_route_ipv4(net, flow, dir, flow_rule); 52 break; 53 case NFPROTO_IPV6: 54 err = nf_flow_rule_route_ipv6(net, flow, dir, flow_rule); 55 break; 56 default: 57 err = -1; 58 break; 59 } 60 61 return err; 62 } 63 64 static struct nf_flowtable_type flowtable_inet = { 65 .family = NFPROTO_INET, 66 .init = nf_flow_table_init, 67 .setup = nf_flow_table_offload_setup, 68 .action = nf_flow_rule_route_inet, 69 .free = nf_flow_table_free, 70 .hook = nf_flow_offload_inet_hook, 71 .owner = THIS_MODULE, 72 }; 73 74 static struct nf_flowtable_type flowtable_ipv4 = { 75 .family = NFPROTO_IPV4, 76 .init = nf_flow_table_init, 77 .setup = nf_flow_table_offload_setup, 78 .action = nf_flow_rule_route_ipv4, 79 .free = nf_flow_table_free, 80 .hook = nf_flow_offload_ip_hook, 81 .owner = THIS_MODULE, 82 }; 83 84 static struct nf_flowtable_type flowtable_ipv6 = { 85 .family = NFPROTO_IPV6, 86 .init = nf_flow_table_init, 87 .setup = nf_flow_table_offload_setup, 88 .action = nf_flow_rule_route_ipv6, 89 .free = nf_flow_table_free, 90 .hook = nf_flow_offload_ipv6_hook, 91 .owner = THIS_MODULE, 92 }; 93 94 static int __init nf_flow_inet_module_init(void) 95 { 96 nft_register_flowtable_type(&flowtable_ipv4); 97 nft_register_flowtable_type(&flowtable_ipv6); 98 nft_register_flowtable_type(&flowtable_inet); 99 100 return 0; 101 } 102 103 static void __exit nf_flow_inet_module_exit(void) 104 { 105 nft_unregister_flowtable_type(&flowtable_inet); 106 nft_unregister_flowtable_type(&flowtable_ipv6); 107 nft_unregister_flowtable_type(&flowtable_ipv4); 108 } 109 110 module_init(nf_flow_inet_module_init); 111 module_exit(nf_flow_inet_module_exit); 112 113 MODULE_LICENSE("GPL"); 114 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); 115 MODULE_ALIAS_NF_FLOWTABLE(AF_INET); 116 MODULE_ALIAS_NF_FLOWTABLE(AF_INET6); 117 MODULE_ALIAS_NF_FLOWTABLE(1); /* NFPROTO_INET */ 118 MODULE_DESCRIPTION("Netfilter flow table mixed IPv4/IPv6 module"); 119