| /* |
| * 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(void *priv, |
| struct sk_buff *skb, |
| const struct nf_hook_state *state) |
| { |
| unsigned int ret; |
| struct nft_pktinfo pkt; |
| struct in6_addr saddr, daddr; |
| u_int8_t hop_limit; |
| u32 mark, flowlabel; |
| int err; |
| |
| nft_set_pktinfo(&pkt, skb, state); |
| nft_set_pktinfo_ipv6(&pkt, skb); |
| |
| /* 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(&pkt, priv); |
| if (ret != NF_DROP && ret != NF_STOLEN && |
| (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)))) { |
| err = ip6_route_me_harder(state->net, skb); |
| if (err < 0) |
| ret = NF_DROP_ERR(err); |
| } |
| |
| return ret; |
| } |
| |
| static const struct nft_chain_type nft_chain_route_ipv6 = { |
| .name = "route", |
| .type = NFT_CHAIN_T_ROUTE, |
| .family = NFPROTO_IPV6, |
| .owner = THIS_MODULE, |
| .hook_mask = (1 << NF_INET_LOCAL_OUT), |
| .hooks = { |
| [NF_INET_LOCAL_OUT] = nf_route_table_hook, |
| }, |
| }; |
| |
| static int __init nft_chain_route_init(void) |
| { |
| nft_register_chain_type(&nft_chain_route_ipv6); |
| |
| return 0; |
| } |
| |
| 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"); |