1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2017 Pablo M. Bermudo Garay <pablombg@gmail.com>
4 *
5 * This code is based on net/netfilter/nft_fib_inet.c, written by
6 * Florian Westphal <fw@strlen.de>.
7 */
8
9#include <linux/kernel.h>
10#include <linux/init.h>
11#include <linux/module.h>
12#include <linux/netlink.h>
13#include <linux/netfilter.h>
14#include <linux/netfilter/nf_tables.h>
15#include <net/netfilter/nf_tables_core.h>
16#include <net/netfilter/nf_tables.h>
17#include <net/ipv6.h>
18
19#include <net/netfilter/nft_fib.h>
20
21static void nft_fib_netdev_eval(const struct nft_expr *expr,
22 struct nft_regs *regs,
23 const struct nft_pktinfo *pkt)
24{
25 const struct nft_fib *priv = nft_expr_priv(expr);
26
27 switch (ntohs(pkt->skb->protocol)) {
28 case ETH_P_IP:
29 switch (priv->result) {
30 case NFT_FIB_RESULT_OIF:
31 case NFT_FIB_RESULT_OIFNAME:
32 return nft_fib4_eval(expr, regs, pkt);
33 case NFT_FIB_RESULT_ADDRTYPE:
34 return nft_fib4_eval_type(expr, regs, pkt);
35 }
36 break;
37 case ETH_P_IPV6:
38 if (!ipv6_mod_enabled())
39 break;
40 switch (priv->result) {
41 case NFT_FIB_RESULT_OIF:
42 case NFT_FIB_RESULT_OIFNAME:
43 return nft_fib6_eval(expr, regs, pkt);
44 case NFT_FIB_RESULT_ADDRTYPE:
45 return nft_fib6_eval_type(expr, regs, pkt);
46 }
47 break;
48 }
49
50 regs->verdict.code = NFT_BREAK;
51}
52
53static struct nft_expr_type nft_fib_netdev_type;
54static const struct nft_expr_ops nft_fib_netdev_ops = {
55 .type = &nft_fib_netdev_type,
56 .size = NFT_EXPR_SIZE(sizeof(struct nft_fib)),
57 .eval = nft_fib_netdev_eval,
58 .init = nft_fib_init,
59 .dump = nft_fib_dump,
60 .validate = nft_fib_validate,
61 .reduce = nft_fib_reduce,
62};
63
64static struct nft_expr_type nft_fib_netdev_type __read_mostly = {
65 .family = NFPROTO_NETDEV,
66 .name = "fib",
67 .ops = &nft_fib_netdev_ops,
68 .policy = nft_fib_policy,
69 .maxattr = NFTA_FIB_MAX,
70 .owner = THIS_MODULE,
71};
72
73static int __init nft_fib_netdev_module_init(void)
74{
75 return nft_register_expr(&nft_fib_netdev_type);
76}
77
78static void __exit nft_fib_netdev_module_exit(void)
79{
80 nft_unregister_expr(&nft_fib_netdev_type);
81}
82
83module_init(nft_fib_netdev_module_init);
84module_exit(nft_fib_netdev_module_exit);
85
86MODULE_LICENSE("GPL");
87MODULE_AUTHOR("Pablo M. Bermudo Garay <pablombg@gmail.com>");
88MODULE_ALIAS_NFT_AF_EXPR(5, "fib");
89MODULE_DESCRIPTION("nftables netdev fib lookups support");
90

source code of linux/net/netfilter/nft_fib_netdev.c