92 lines
2.2 KiB
C
92 lines
2.2 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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#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_ipv4.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_ipv4.h>
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#include <net/route.h>
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#include <net/ip.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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u32 mark;
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__be32 saddr, daddr;
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u_int8_t tos;
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const struct iphdr *iph;
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int err;
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/* root is playing with raw sockets. */
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if (skb->len < sizeof(struct iphdr) ||
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ip_hdrlen(skb) < sizeof(struct iphdr))
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return NF_ACCEPT;
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nft_set_pktinfo_ipv4(&pkt, skb, state);
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mark = skb->mark;
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iph = ip_hdr(skb);
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saddr = iph->saddr;
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daddr = iph->daddr;
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tos = iph->tos;
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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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iph = ip_hdr(skb);
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if (iph->saddr != saddr ||
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iph->daddr != daddr ||
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skb->mark != mark ||
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iph->tos != tos) {
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err = ip_route_me_harder(state->net, skb, RTN_UNSPEC);
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if (err < 0)
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ret = NF_DROP_ERR(err);
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}
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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_ipv4 = {
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.name = "route",
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.type = NFT_CHAIN_T_ROUTE,
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.family = NFPROTO_IPV4,
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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_ipv4);
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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_ipv4);
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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_INET, "route");
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