![Pablo Neira Ayuso](/assets/img/avatar_default.png)
This patch adds the x_tables compatibility layer. This allows you to use existing x_tables matches and targets from nf_tables. This compatibility later allows us to use existing matches/targets for features that are still missing in nf_tables. We can progressively replace them with native nf_tables extensions. It also provides the userspace compatibility software that allows you to express the rule-set using the iptables syntax but using the nf_tables kernel components. In order to get this compatibility layer working, I've done the following things: * add NFNL_SUBSYS_NFT_COMPAT: this new nfnetlink subsystem is used to query the x_tables match/target revision, so we don't need to use the native x_table getsockopt interface. * emulate xt structures: this required extending the struct nft_pktinfo to include the fragment offset, which is already obtained from ip[6]_tables and that is used by some matches/targets. * add support for default policy to base chains, required to emulate x_tables. * add NFTA_CHAIN_USE attribute to obtain the number of references to chains, required by x_tables emulation. * add chain packet/byte counters using per-cpu. * support 32-64 bits compat. For historical reasons, this patch includes the following patches that were posted in the netfilter-devel mailing list. From Pablo Neira Ayuso: * nf_tables: add default policy to base chains * netfilter: nf_tables: add NFTA_CHAIN_USE attribute * nf_tables: nft_compat: private data of target and matches in contiguous area * nf_tables: validate hooks for compat match/target * nf_tables: nft_compat: release cached matches/targets * nf_tables: x_tables support as a compile time option * nf_tables: fix alias for xtables over nftables module * nf_tables: add packet and byte counters per chain * nf_tables: fix per-chain counter stats if no counters are passed * nf_tables: don't bump chain stats * nf_tables: add protocol and flags for xtables over nf_tables * nf_tables: add ip[6]t_entry emulation * nf_tables: move specific layer 3 compat code to nf_tables_ipv[4|6] * nf_tables: support 32bits-64bits x_tables compat * nf_tables: fix compilation if CONFIG_COMPAT is disabled From Patrick McHardy: * nf_tables: move policy to struct nft_base_chain * nf_tables: send notifications for base chain policy changes From Alexander Primak: * nf_tables: remove the duplicate NF_INET_LOCAL_OUT From Nicolas Dichtel: * nf_tables: fix compilation when nf-netlink is a module Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
89 lines
2.6 KiB
C
89 lines
2.6 KiB
C
/*
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* Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
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* Copyright (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org>
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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/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_ipv6.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.h>
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#include <net/netfilter/nf_tables_ipv6.h>
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#include <net/route.h>
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static unsigned int nf_route_table_hook(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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unsigned int ret;
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struct nft_pktinfo pkt;
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struct in6_addr saddr, daddr;
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u_int8_t hop_limit;
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u32 mark, flowlabel;
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/* malformed packet, drop it */
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if (nft_set_pktinfo_ipv6(&pkt, ops, skb, in, out) < 0)
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return NF_DROP;
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/* save source/dest address, mark, hoplimit, flowlabel, priority */
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memcpy(&saddr, &ipv6_hdr(skb)->saddr, sizeof(saddr));
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memcpy(&daddr, &ipv6_hdr(skb)->daddr, sizeof(daddr));
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mark = skb->mark;
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hop_limit = ipv6_hdr(skb)->hop_limit;
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/* flowlabel and prio (includes version, which shouldn't change either */
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flowlabel = *((u32 *)ipv6_hdr(skb));
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ret = nft_do_chain_pktinfo(&pkt, ops);
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if (ret != NF_DROP && ret != NF_QUEUE &&
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(memcmp(&ipv6_hdr(skb)->saddr, &saddr, sizeof(saddr)) ||
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memcmp(&ipv6_hdr(skb)->daddr, &daddr, sizeof(daddr)) ||
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skb->mark != mark ||
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ipv6_hdr(skb)->hop_limit != hop_limit ||
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flowlabel != *((u_int32_t *)ipv6_hdr(skb))))
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return ip6_route_me_harder(skb) == 0 ? ret : NF_DROP;
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return ret;
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}
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static struct nf_chain_type nft_chain_route_ipv6 = {
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.family = NFPROTO_IPV6,
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.name = "route",
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.type = NFT_CHAIN_T_ROUTE,
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.hook_mask = (1 << NF_INET_LOCAL_OUT),
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.fn = {
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[NF_INET_LOCAL_OUT] = nf_route_table_hook,
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},
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.me = THIS_MODULE,
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};
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static int __init nft_chain_route_init(void)
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{
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return nft_register_chain_type(&nft_chain_route_ipv6);
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}
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static void __exit nft_chain_route_exit(void)
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{
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nft_unregister_chain_type(&nft_chain_route_ipv6);
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}
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module_init(nft_chain_route_init);
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module_exit(nft_chain_route_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
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MODULE_ALIAS_NFT_CHAIN(AF_INET6, "route");
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