// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2017 Pablo M. Bermudo Garay <pablombg@gmail.com>
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*
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* This code is based on net/netfilter/nft_fib_inet.c, written by
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* Florian Westphal <fw@strlen.de>.
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*/
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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/netlink.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/nf_tables.h>
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#include <net/netfilter/nf_tables_core.h>
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#include <net/netfilter/nf_tables.h>
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#include <net/ipv6.h>
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#include <net/netfilter/nft_fib.h>
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static void nft_fib_netdev_eval(const struct nft_expr *expr,
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struct nft_regs *regs,
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const struct nft_pktinfo *pkt)
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{
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const struct nft_fib *priv = nft_expr_priv(expr);
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switch (ntohs(pkt->skb->protocol)) {
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case ETH_P_IP:
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switch (priv->result) {
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case NFT_FIB_RESULT_OIF:
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case NFT_FIB_RESULT_OIFNAME:
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return nft_fib4_eval(expr, regs, pkt);
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case NFT_FIB_RESULT_ADDRTYPE:
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return nft_fib4_eval_type(expr, regs, pkt);
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}
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break;
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case ETH_P_IPV6:
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if (!ipv6_mod_enabled())
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break;
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switch (priv->result) {
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case NFT_FIB_RESULT_OIF:
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case NFT_FIB_RESULT_OIFNAME:
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return nft_fib6_eval(expr, regs, pkt);
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case NFT_FIB_RESULT_ADDRTYPE:
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return nft_fib6_eval_type(expr, regs, pkt);
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}
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break;
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}
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regs->verdict.code = NFT_BREAK;
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}
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static struct nft_expr_type nft_fib_netdev_type;
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static const struct nft_expr_ops nft_fib_netdev_ops = {
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.type = &nft_fib_netdev_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_fib)),
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.eval = nft_fib_netdev_eval,
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.init = nft_fib_init,
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.dump = nft_fib_dump,
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.validate = nft_fib_validate,
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};
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static struct nft_expr_type nft_fib_netdev_type __read_mostly = {
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.family = NFPROTO_NETDEV,
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.name = "fib",
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.ops = &nft_fib_netdev_ops,
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.policy = nft_fib_policy,
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.maxattr = NFTA_FIB_MAX,
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.owner = THIS_MODULE,
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};
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static int __init nft_fib_netdev_module_init(void)
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{
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return nft_register_expr(&nft_fib_netdev_type);
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}
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static void __exit nft_fib_netdev_module_exit(void)
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{
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nft_unregister_expr(&nft_fib_netdev_type);
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}
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module_init(nft_fib_netdev_module_init);
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module_exit(nft_fib_netdev_module_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Pablo M. Bermudo Garay <pablombg@gmail.com>");
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MODULE_ALIAS_NFT_AF_EXPR(5, "fib");
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MODULE_DESCRIPTION("nftables netdev fib lookups support");
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