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 | |
21 | static 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 | |
53 | static struct nft_expr_type nft_fib_netdev_type; |
54 | static 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 | |
64 | static 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 | |
73 | static int __init nft_fib_netdev_module_init(void) |
74 | { |
75 | return nft_register_expr(&nft_fib_netdev_type); |
76 | } |
77 | |
78 | static void __exit nft_fib_netdev_module_exit(void) |
79 | { |
80 | nft_unregister_expr(&nft_fib_netdev_type); |
81 | } |
82 | |
83 | module_init(nft_fib_netdev_module_init); |
84 | module_exit(nft_fib_netdev_module_exit); |
85 | |
86 | MODULE_LICENSE("GPL" ); |
87 | MODULE_AUTHOR("Pablo M. Bermudo Garay <pablombg@gmail.com>" ); |
88 | MODULE_ALIAS_NFT_AF_EXPR(5, "fib" ); |
89 | MODULE_DESCRIPTION("nftables netdev fib lookups support" ); |
90 | |