projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 8b13eddf AB |
1 | /* |
| 2 | * (C) 1999-2001 Paul `Rusty' Russell | |
| 3 | * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org> | |
| 4 | * Copyright (c) 2011 Patrick McHardy <kaber@trash.net> | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License version 2 as | |
| 8 | * published by the Free Software Foundation. | |
| 9 | * | |
| 10 | * Based on Rusty Russell's IPv4 REDIRECT target. Development of IPv6 | |
| 11 | * NAT funded by Astaro. | |
| 12 | */ | |
| 13 | ||
| 14 | #include <linux/if.h> | |
| 15 | #include <linux/inetdevice.h> | |
| 16 | #include <linux/ip.h> | |
| 17 | #include <linux/kernel.h> | |
| 18 | #include <linux/module.h> | |
| 19 | #include <linux/netdevice.h> | |
| 20 | #include <linux/netfilter.h> | |
| 21 | #include <linux/types.h> | |
| 22 | #include <linux/netfilter_ipv4.h> | |
| b59eaf9e | 23 | #include <linux/netfilter_ipv6.h> |
| 8b13eddf AB |
24 | #include <linux/netfilter/x_tables.h> |
| 25 | #include <net/addrconf.h> | |
| 26 | #include <net/checksum.h> | |
| 27 | #include <net/protocol.h> | |
| 28 | #include <net/netfilter/nf_nat.h> | |
| b59eaf9e | 29 | #include <net/netfilter/nf_nat_redirect.h> |
| 8b13eddf AB |
30 | |
| 31 | unsigned int | |
| 32 | nf_nat_redirect_ipv4(struct sk_buff *skb, | |
| 33 | const struct nf_nat_ipv4_multi_range_compat *mr, | |
| 34 | unsigned int hooknum) | |
| 35 | { | |
| 36 | struct nf_conn *ct; | |
| 37 | enum ip_conntrack_info ctinfo; | |
| 38 | __be32 newdst; | |
| 39 | struct nf_nat_range newrange; | |
| 40 | ||
| 41 | NF_CT_ASSERT(hooknum == NF_INET_PRE_ROUTING || | |
| 42 | hooknum == NF_INET_LOCAL_OUT); | |
| 43 | ||
| 44 | ct = nf_ct_get(skb, &ctinfo); | |
| 45 | NF_CT_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED)); | |
| 46 | ||
| 47 | /* Local packets: make them go to loopback */ | |
| 48 | if (hooknum == NF_INET_LOCAL_OUT) { | |
| 49 | newdst = htonl(0x7F000001); | |
| 50 | } else { | |
| 51 | struct in_device *indev; | |
| 52 | struct in_ifaddr *ifa; | |
| 53 | ||
| 54 | newdst = 0; | |
| 55 | ||
| 56 | rcu_read_lock(); | |
| 57 | indev = __in_dev_get_rcu(skb->dev); | |
| 58 | if (indev != NULL) { | |
| 59 | ifa = indev->ifa_list; | |
| 60 | newdst = ifa->ifa_local; | |
| 61 | } | |
| 62 | rcu_read_unlock(); | |
| 63 | ||
| 64 | if (!newdst) | |
| 65 | return NF_DROP; | |
| 66 | } | |
| 67 | ||
| 68 | /* Transfer from original range. */ | |
| 69 | memset(&newrange.min_addr, 0, sizeof(newrange.min_addr)); | |
| 70 | memset(&newrange.max_addr, 0, sizeof(newrange.max_addr)); | |
| 71 | newrange.flags = mr->range[0].flags | NF_NAT_RANGE_MAP_IPS; | |
| 72 | newrange.min_addr.ip = newdst; | |
| 73 | newrange.max_addr.ip = newdst; | |
| 74 | newrange.min_proto = mr->range[0].min; | |
| 75 | newrange.max_proto = mr->range[0].max; | |
| 76 | ||
| 77 | /* Hand modified range to generic setup. */ | |
| 78 | return nf_nat_setup_info(ct, &newrange, NF_NAT_MANIP_DST); | |
| 79 | } | |
| 80 | EXPORT_SYMBOL_GPL(nf_nat_redirect_ipv4); | |
| 81 | ||
| b59eaf9e PNA |
82 | static const struct in6_addr loopback_addr = IN6ADDR_LOOPBACK_INIT; |
| 83 | ||
| 84 | unsigned int | |
| 85 | nf_nat_redirect_ipv6(struct sk_buff *skb, const struct nf_nat_range *range, | |
| 86 | unsigned int hooknum) | |
| 87 | { | |
| 88 | struct nf_nat_range newrange; | |
| 89 | struct in6_addr newdst; | |
| 90 | enum ip_conntrack_info ctinfo; | |
| 91 | struct nf_conn *ct; | |
| 92 | ||
| 93 | ct = nf_ct_get(skb, &ctinfo); | |
| 94 | if (hooknum == NF_INET_LOCAL_OUT) { | |
| 95 | newdst = loopback_addr; | |
| 96 | } else { | |
| 97 | struct inet6_dev *idev; | |
| 98 | struct inet6_ifaddr *ifa; | |
| 99 | bool addr = false; | |
| 100 | ||
| 101 | rcu_read_lock(); | |
| 102 | idev = __in6_dev_get(skb->dev); | |
| 103 | if (idev != NULL) { | |
| 104 | list_for_each_entry(ifa, &idev->addr_list, if_list) { | |
| 105 | newdst = ifa->addr; | |
| 106 | addr = true; | |
| 107 | break; | |
| 108 | } | |
| 109 | } | |
| 110 | rcu_read_unlock(); | |
| 111 | ||
| 112 | if (!addr) | |
| 113 | return NF_DROP; | |
| 114 | } | |
| 115 | ||
| 116 | newrange.flags = range->flags | NF_NAT_RANGE_MAP_IPS; | |
| 117 | newrange.min_addr.in6 = newdst; | |
| 118 | newrange.max_addr.in6 = newdst; | |
| 119 | newrange.min_proto = range->min_proto; | |
| 120 | newrange.max_proto = range->max_proto; | |
| 121 | ||
| 122 | return nf_nat_setup_info(ct, &newrange, NF_NAT_MANIP_DST); | |
| 123 | } | |
| 124 | EXPORT_SYMBOL_GPL(nf_nat_redirect_ipv6); | |
| 125 | ||
| 8b13eddf AB |
126 | MODULE_LICENSE("GPL"); |
| 127 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |