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 if (!nf_flow_pppoe_proto(skb, &proto)) 25 return NF_ACCEPT; 26 break; 27 default: 28 proto = skb->protocol; 29 break; 30 } 31 32 switch (proto) { 33 case htons(ETH_P_IP): 34 return nf_flow_offload_ip_hook(priv, skb, state); 35 case htons(ETH_P_IPV6): 36 return nf_flow_offload_ipv6_hook(priv, skb, state); 37 } 38 39 return NF_ACCEPT; 40 } 41 42 static int nf_flow_rule_route_inet(struct net *net, 43 struct flow_offload *flow, 44 enum flow_offload_tuple_dir dir, 45 struct nf_flow_rule *flow_rule) 46 { 47 const struct flow_offload_tuple *flow_tuple = &flow->tuplehash[dir].tuple; 48 int err; 49 50 switch (flow_tuple->l3proto) { 51 case NFPROTO_IPV4: 52 err = nf_flow_rule_route_ipv4(net, flow, dir, flow_rule); 53 break; 54 case NFPROTO_IPV6: 55 err = nf_flow_rule_route_ipv6(net, flow, dir, flow_rule); 56 break; 57 default: 58 err = -1; 59 break; 60 } 61 62 return err; 63 } 64 65 static struct nf_flowtable_type flowtable_inet = { 66 .family = NFPROTO_INET, 67 .init = nf_flow_table_init, 68 .setup = nf_flow_table_offload_setup, 69 .action = nf_flow_rule_route_inet, 70 .free = nf_flow_table_free, 71 .hook = nf_flow_offload_inet_hook, 72 .owner = THIS_MODULE, 73 }; 74 75 static struct nf_flowtable_type flowtable_ipv4 = { 76 .family = NFPROTO_IPV4, 77 .init = nf_flow_table_init, 78 .setup = nf_flow_table_offload_setup, 79 .action = nf_flow_rule_route_ipv4, 80 .free = nf_flow_table_free, 81 .hook = nf_flow_offload_ip_hook, 82 .owner = THIS_MODULE, 83 }; 84 85 static struct nf_flowtable_type flowtable_ipv6 = { 86 .family = NFPROTO_IPV6, 87 .init = nf_flow_table_init, 88 .setup = nf_flow_table_offload_setup, 89 .action = nf_flow_rule_route_ipv6, 90 .free = nf_flow_table_free, 91 .hook = nf_flow_offload_ipv6_hook, 92 .owner = THIS_MODULE, 93 }; 94 95 static int __init nf_flow_inet_module_init(void) 96 { 97 nft_register_flowtable_type(&flowtable_ipv4); 98 nft_register_flowtable_type(&flowtable_ipv6); 99 nft_register_flowtable_type(&flowtable_inet); 100 101 return nf_flow_register_bpf(); 102 } 103 104 static void __exit nf_flow_inet_module_exit(void) 105 { 106 nft_unregister_flowtable_type(&flowtable_inet); 107 nft_unregister_flowtable_type(&flowtable_ipv6); 108 nft_unregister_flowtable_type(&flowtable_ipv4); 109 } 110 111 module_init(nf_flow_inet_module_init); 112 module_exit(nf_flow_inet_module_exit); 113 114 MODULE_LICENSE("GPL"); 115 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); 116 MODULE_ALIAS_NF_FLOWTABLE(AF_INET); 117 MODULE_ALIAS_NF_FLOWTABLE(AF_INET6); 118 MODULE_ALIAS_NF_FLOWTABLE(1); /* NFPROTO_INET */ 119 MODULE_DESCRIPTION("Netfilter flow table mixed IPv4/IPv6 module"); 120
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