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 | ||
| 10 | #include <linux/module.h> | |
| 11 | #include <linux/init.h> | |
| 12 | #include <linux/list.h> | |
| 13 | #include <linux/skbuff.h> | |
| 14 | #include <linux/netlink.h> | |
| 15 | #include <linux/netfilter.h> | |
| 16 | #include <linux/netfilter_ipv4.h> | |
| 17 | #include <linux/netfilter/nfnetlink.h> | |
| 18 | #include <linux/netfilter/nf_tables.h> | |
| 19 | #include <net/netfilter/nf_tables.h> | |
| 0ca743a5 | 20 | #include <net/netfilter/nf_tables_ipv4.h> |
| 96518518 PM |
21 | #include <net/route.h> |
| 22 | #include <net/ip.h> | |
| 23 | ||
| 06198b34 | 24 | static unsigned int nf_route_table_hook(void *priv, |
| 96518518 | 25 | struct sk_buff *skb, |
| 238e54c9 | 26 | const struct nf_hook_state *state) |
| 96518518 PM |
27 | { |
| 28 | unsigned int ret; | |
| 0ca743a5 | 29 | struct nft_pktinfo pkt; |
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30 | u32 mark; |
| 31 | __be32 saddr, daddr; | |
| 32 | u_int8_t tos; | |
| 33 | const struct iphdr *iph; | |
| d1a6cba5 | 34 | int err; |
| 96518518 PM |
35 | |
| 36 | /* root is playing with raw sockets. */ | |
| 37 | if (skb->len < sizeof(struct iphdr) || | |
| 38 | ip_hdrlen(skb) < sizeof(struct iphdr)) | |
| 39 | return NF_ACCEPT; | |
| 40 | ||
| 6aa187f2 | 41 | nft_set_pktinfo_ipv4(&pkt, skb, state); |
| 0ca743a5 | 42 | |
| 96518518 PM |
43 | mark = skb->mark; |
| 44 | iph = ip_hdr(skb); | |
| 45 | saddr = iph->saddr; | |
| 46 | daddr = iph->daddr; | |
| 47 | tos = iph->tos; | |
| 48 | ||
| 06198b34 | 49 | ret = nft_do_chain(&pkt, priv); |
| d1a6cba5 | 50 | if (ret != NF_DROP && ret != NF_STOLEN) { |
| 96518518 PM |
51 | iph = ip_hdr(skb); |
| 52 | ||
| 53 | if (iph->saddr != saddr || | |
| 54 | iph->daddr != daddr || | |
| 55 | skb->mark != mark || | |
| d1a6cba5 LZ |
56 | iph->tos != tos) { |
| 57 | err = ip_route_me_harder(state->net, skb, RTN_UNSPEC); | |
| 58 | if (err < 0) | |
| 59 | ret = NF_DROP_ERR(err); | |
| 60 | } | |
| 96518518 PM |
61 | } |
| 62 | return ret; | |
| 63 | } | |
| 64 | ||
| 2a37d755 | 65 | static const struct nf_chain_type nft_chain_route_ipv4 = { |
| 9370761c PNA |
66 | .name = "route", |
| 67 | .type = NFT_CHAIN_T_ROUTE, | |
| fa2c1de0 PM |
68 | .family = NFPROTO_IPV4, |
| 69 | .owner = THIS_MODULE, | |
| 9370761c | 70 | .hook_mask = (1 << NF_INET_LOCAL_OUT), |
| fa2c1de0 | 71 | .hooks = { |
| 9370761c | 72 | [NF_INET_LOCAL_OUT] = nf_route_table_hook, |
| 96518518 | 73 | }, |
| 96518518 PM |
74 | }; |
| 75 | ||
| 9370761c | 76 | static int __init nft_chain_route_init(void) |
| 96518518 | 77 | { |
| 9370761c | 78 | return nft_register_chain_type(&nft_chain_route_ipv4); |
| 96518518 PM |
79 | } |
| 80 | ||
| 9370761c | 81 | static void __exit nft_chain_route_exit(void) |
| 96518518 | 82 | { |
| 9370761c | 83 | nft_unregister_chain_type(&nft_chain_route_ipv4); |
| 96518518 PM |
84 | } |
| 85 | ||
| 9370761c PNA |
86 | module_init(nft_chain_route_init); |
| 87 | module_exit(nft_chain_route_exit); | |
| 96518518 PM |
88 | |
| 89 | MODULE_LICENSE("GPL"); | |
| 90 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
| 9370761c | 91 | MODULE_ALIAS_NFT_CHAIN(AF_INET, "route"); |