89 lines
2.4 KiB
C
89 lines
2.4 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(void *priv,
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struct sk_buff *skb,
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const struct nf_hook_state *state)
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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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int err;
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nft_set_pktinfo_ipv6(&pkt, skb, state);
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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(&pkt, priv);
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if (ret != NF_DROP && ret != NF_STOLEN &&
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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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err = ip6_route_me_harder(state->net, skb);
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if (err < 0)
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ret = NF_DROP_ERR(err);
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}
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return ret;
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}
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static const struct nf_chain_type nft_chain_route_ipv6 = {
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.name = "route",
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.type = NFT_CHAIN_T_ROUTE,
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.family = NFPROTO_IPV6,
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.owner = THIS_MODULE,
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.hook_mask = (1 << NF_INET_LOCAL_OUT),
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.hooks = {
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[NF_INET_LOCAL_OUT] = nf_route_table_hook,
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},
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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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