projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 96518518 PM |
1 | /* |
| 2 | * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> | |
| 9370761c | 3 | * Copyright (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org> |
| 96518518 PM |
4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify | |
| 6 | * it under the terms of the GNU General Public License version 2 as | |
| 7 | * published by the Free Software Foundation. | |
| 8 | * | |
| 9 | * Development of this code funded by Astaro AG (http://www.astaro.com/) | |
| 10 | */ | |
| 11 | ||
| 12 | #include <linux/module.h> | |
| 13 | #include <linux/init.h> | |
| 14 | #include <linux/list.h> | |
| 15 | #include <linux/skbuff.h> | |
| 16 | #include <linux/netlink.h> | |
| 17 | #include <linux/netfilter.h> | |
| 18 | #include <linux/netfilter_ipv6.h> | |
| 19 | #include <linux/netfilter/nfnetlink.h> | |
| 20 | #include <linux/netfilter/nf_tables.h> | |
| 21 | #include <net/netfilter/nf_tables.h> | |
| 0ca743a5 | 22 | #include <net/netfilter/nf_tables_ipv6.h> |
| 96518518 PM |
23 | #include <net/route.h> |
| 24 | ||
| 06198b34 | 25 | static unsigned int nf_route_table_hook(void *priv, |
| 96518518 | 26 | struct sk_buff *skb, |
| 238e54c9 | 27 | const struct nf_hook_state *state) |
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28 | { |
| 29 | unsigned int ret; | |
| 0ca743a5 | 30 | struct nft_pktinfo pkt; |
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31 | struct in6_addr saddr, daddr; |
| 32 | u_int8_t hop_limit; | |
| 33 | u32 mark, flowlabel; | |
| d1a6cba5 | 34 | int err; |
| 96518518 | 35 | |
| 0ca743a5 | 36 | /* malformed packet, drop it */ |
| 6aa187f2 | 37 | if (nft_set_pktinfo_ipv6(&pkt, skb, state) < 0) |
| 0ca743a5 PNA |
38 | return NF_DROP; |
| 39 | ||
| 96518518 PM |
40 | /* save source/dest address, mark, hoplimit, flowlabel, priority */ |
| 41 | memcpy(&saddr, &ipv6_hdr(skb)->saddr, sizeof(saddr)); | |
| 42 | memcpy(&daddr, &ipv6_hdr(skb)->daddr, sizeof(daddr)); | |
| 43 | mark = skb->mark; | |
| 44 | hop_limit = ipv6_hdr(skb)->hop_limit; | |
| 45 | ||
| 46 | /* flowlabel and prio (includes version, which shouldn't change either */ | |
| 47 | flowlabel = *((u32 *)ipv6_hdr(skb)); | |
| 48 | ||
| 06198b34 | 49 | ret = nft_do_chain(&pkt, priv); |
| d1a6cba5 | 50 | if (ret != NF_DROP && ret != NF_STOLEN && |
| 96518518 PM |
51 | (memcmp(&ipv6_hdr(skb)->saddr, &saddr, sizeof(saddr)) || |
| 52 | memcmp(&ipv6_hdr(skb)->daddr, &daddr, sizeof(daddr)) || | |
| 53 | skb->mark != mark || | |
| 54 | ipv6_hdr(skb)->hop_limit != hop_limit || | |
| d1a6cba5 LZ |
55 | flowlabel != *((u_int32_t *)ipv6_hdr(skb)))) { |
| 56 | err = ip6_route_me_harder(state->net, skb); | |
| 57 | if (err < 0) | |
| 58 | ret = NF_DROP_ERR(err); | |
| 59 | } | |
| 96518518 PM |
60 | |
| 61 | return ret; | |
| 62 | } | |
| 63 | ||
| 2a37d755 | 64 | static const struct nf_chain_type nft_chain_route_ipv6 = { |
| 9370761c PNA |
65 | .name = "route", |
| 66 | .type = NFT_CHAIN_T_ROUTE, | |
| fa2c1de0 | 67 | .family = NFPROTO_IPV6, |
| 7695495d | 68 | .owner = THIS_MODULE, |
| 9370761c | 69 | .hook_mask = (1 << NF_INET_LOCAL_OUT), |
| fa2c1de0 | 70 | .hooks = { |
| 7695495d IM |
71 | [NF_INET_LOCAL_OUT] = nf_route_table_hook, |
| 72 | }, | |
| 96518518 PM |
73 | }; |
| 74 | ||
| 9370761c | 75 | static int __init nft_chain_route_init(void) |
| 96518518 | 76 | { |
| 9370761c | 77 | return nft_register_chain_type(&nft_chain_route_ipv6); |
| 96518518 PM |
78 | } |
| 79 | ||
| 9370761c | 80 | static void __exit nft_chain_route_exit(void) |
| 96518518 | 81 | { |
| 9370761c | 82 | nft_unregister_chain_type(&nft_chain_route_ipv6); |
| 96518518 PM |
83 | } |
| 84 | ||
| 9370761c PNA |
85 | module_init(nft_chain_route_init); |
| 86 | module_exit(nft_chain_route_exit); | |
| 96518518 PM |
87 | |
| 88 | MODULE_LICENSE("GPL"); | |
| 89 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
| 9370761c | 90 | MODULE_ALIAS_NFT_CHAIN(AF_INET6, "route"); |