151 lines
3.2 KiB
C
151 lines
3.2 KiB
C
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/*
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* Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Development of this code funded by Astaro AG (http://www.astaro.com/)
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/rculist.h>
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#include <linux/skbuff.h>
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#include <linux/netlink.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/nfnetlink.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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unsigned int nft_do_chain(const struct nf_hook_ops *ops,
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struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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int (*okfn)(struct sk_buff *))
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{
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const struct nft_chain *chain = ops->priv;
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const struct nft_rule *rule;
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const struct nft_expr *expr, *last;
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struct nft_data data[NFT_REG_MAX + 1];
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const struct nft_pktinfo pkt = {
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.skb = skb,
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.in = in,
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.out = out,
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.hooknum = ops->hooknum,
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};
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unsigned int stackptr = 0;
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struct {
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const struct nft_chain *chain;
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const struct nft_rule *rule;
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} jumpstack[NFT_JUMP_STACK_SIZE];
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do_chain:
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rule = list_entry(&chain->rules, struct nft_rule, list);
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next_rule:
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data[NFT_REG_VERDICT].verdict = NFT_CONTINUE;
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list_for_each_entry_continue_rcu(rule, &chain->rules, list) {
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nft_rule_for_each_expr(expr, last, rule) {
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expr->ops->eval(expr, data, &pkt);
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if (data[NFT_REG_VERDICT].verdict != NFT_CONTINUE)
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break;
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}
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switch (data[NFT_REG_VERDICT].verdict) {
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case NFT_BREAK:
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data[NFT_REG_VERDICT].verdict = NFT_CONTINUE;
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/* fall through */
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case NFT_CONTINUE:
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continue;
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}
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break;
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}
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switch (data[NFT_REG_VERDICT].verdict) {
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case NF_ACCEPT:
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case NF_DROP:
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case NF_QUEUE:
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return data[NFT_REG_VERDICT].verdict;
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case NFT_JUMP:
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BUG_ON(stackptr >= NFT_JUMP_STACK_SIZE);
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jumpstack[stackptr].chain = chain;
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jumpstack[stackptr].rule = rule;
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stackptr++;
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/* fall through */
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case NFT_GOTO:
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chain = data[NFT_REG_VERDICT].chain;
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goto do_chain;
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case NFT_RETURN:
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case NFT_CONTINUE:
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break;
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default:
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WARN_ON(1);
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}
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if (stackptr > 0) {
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stackptr--;
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chain = jumpstack[stackptr].chain;
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rule = jumpstack[stackptr].rule;
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goto next_rule;
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}
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return NF_ACCEPT;
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}
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EXPORT_SYMBOL_GPL(nft_do_chain);
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int __init nf_tables_core_module_init(void)
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{
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int err;
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err = nft_immediate_module_init();
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if (err < 0)
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goto err1;
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err = nft_cmp_module_init();
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if (err < 0)
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goto err2;
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err = nft_lookup_module_init();
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if (err < 0)
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goto err3;
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err = nft_bitwise_module_init();
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if (err < 0)
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goto err4;
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err = nft_byteorder_module_init();
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if (err < 0)
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goto err5;
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err = nft_payload_module_init();
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if (err < 0)
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goto err6;
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return 0;
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err6:
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nft_byteorder_module_exit();
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err5:
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nft_bitwise_module_exit();
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err4:
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nft_lookup_module_exit();
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err3:
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nft_cmp_module_exit();
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err2:
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nft_immediate_module_exit();
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err1:
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return err;
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}
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void nf_tables_core_module_exit(void)
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{
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nft_payload_module_exit();
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nft_byteorder_module_exit();
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nft_bitwise_module_exit();
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nft_lookup_module_exit();
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nft_cmp_module_exit();
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nft_immediate_module_exit();
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}
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