0ca743a559
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
/*
|
|
* Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
|
|
* Copyright (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* Development of this code funded by Astaro AG (http://www.astaro.com/)
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/list.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/netlink.h>
|
|
#include <linux/netfilter.h>
|
|
#include <linux/netfilter_ipv6.h>
|
|
#include <linux/netfilter/nfnetlink.h>
|
|
#include <linux/netfilter/nf_tables.h>
|
|
#include <net/netfilter/nf_tables.h>
|
|
#include <net/netfilter/nf_tables_ipv6.h>
|
|
#include <net/route.h>
|
|
|
|
static unsigned int nf_route_table_hook(const struct nf_hook_ops *ops,
|
|
struct sk_buff *skb,
|
|
const struct net_device *in,
|
|
const struct net_device *out,
|
|
int (*okfn)(struct sk_buff *))
|
|
{
|
|
unsigned int ret;
|
|
struct nft_pktinfo pkt;
|
|
struct in6_addr saddr, daddr;
|
|
u_int8_t hop_limit;
|
|
u32 mark, flowlabel;
|
|
|
|
/* malformed packet, drop it */
|
|
if (nft_set_pktinfo_ipv6(&pkt, ops, skb, in, out) < 0)
|
|
return NF_DROP;
|
|
|
|
/* save source/dest address, mark, hoplimit, flowlabel, priority */
|
|
memcpy(&saddr, &ipv6_hdr(skb)->saddr, sizeof(saddr));
|
|
memcpy(&daddr, &ipv6_hdr(skb)->daddr, sizeof(daddr));
|
|
mark = skb->mark;
|
|
hop_limit = ipv6_hdr(skb)->hop_limit;
|
|
|
|
/* flowlabel and prio (includes version, which shouldn't change either */
|
|
flowlabel = *((u32 *)ipv6_hdr(skb));
|
|
|
|
ret = nft_do_chain_pktinfo(&pkt, ops);
|
|
if (ret != NF_DROP && ret != NF_QUEUE &&
|
|
(memcmp(&ipv6_hdr(skb)->saddr, &saddr, sizeof(saddr)) ||
|
|
memcmp(&ipv6_hdr(skb)->daddr, &daddr, sizeof(daddr)) ||
|
|
skb->mark != mark ||
|
|
ipv6_hdr(skb)->hop_limit != hop_limit ||
|
|
flowlabel != *((u_int32_t *)ipv6_hdr(skb))))
|
|
return ip6_route_me_harder(skb) == 0 ? ret : NF_DROP;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct nf_chain_type nft_chain_route_ipv6 = {
|
|
.family = NFPROTO_IPV6,
|
|
.name = "route",
|
|
.type = NFT_CHAIN_T_ROUTE,
|
|
.hook_mask = (1 << NF_INET_LOCAL_OUT),
|
|
.fn = {
|
|
[NF_INET_LOCAL_OUT] = nf_route_table_hook,
|
|
},
|
|
.me = THIS_MODULE,
|
|
};
|
|
|
|
static int __init nft_chain_route_init(void)
|
|
{
|
|
return nft_register_chain_type(&nft_chain_route_ipv6);
|
|
}
|
|
|
|
static void __exit nft_chain_route_exit(void)
|
|
{
|
|
nft_unregister_chain_type(&nft_chain_route_ipv6);
|
|
}
|
|
|
|
module_init(nft_chain_route_init);
|
|
module_exit(nft_chain_route_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
|
|
MODULE_ALIAS_NFT_CHAIN(AF_INET6, "route");
|