projects / mirror_ubuntu-jammy-kernel.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> | |
| 23 | #include <linux/netfilter/x_tables.h> | |
| 24 | #include <net/addrconf.h> | |
| 25 | #include <net/checksum.h> | |
| 26 | #include <net/protocol.h> | |
| 27 | #include <net/netfilter/nf_nat.h> | |
| 28 | #include <net/netfilter/ipv4/nf_nat_redirect.h> | |
| 29 | ||
| 30 | unsigned int | |
| 31 | nf_nat_redirect_ipv4(struct sk_buff *skb, | |
| 32 | const struct nf_nat_ipv4_multi_range_compat *mr, | |
| 33 | unsigned int hooknum) | |
| 34 | { | |
| 35 | struct nf_conn *ct; | |
| 36 | enum ip_conntrack_info ctinfo; | |
| 37 | __be32 newdst; | |
| 38 | struct nf_nat_range newrange; | |
| 39 | ||
| 40 | NF_CT_ASSERT(hooknum == NF_INET_PRE_ROUTING || | |
| 41 | hooknum == NF_INET_LOCAL_OUT); | |
| 42 | ||
| 43 | ct = nf_ct_get(skb, &ctinfo); | |
| 44 | NF_CT_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED)); | |
| 45 | ||
| 46 | /* Local packets: make them go to loopback */ | |
| 47 | if (hooknum == NF_INET_LOCAL_OUT) { | |
| 48 | newdst = htonl(0x7F000001); | |
| 49 | } else { | |
| 50 | struct in_device *indev; | |
| 51 | struct in_ifaddr *ifa; | |
| 52 | ||
| 53 | newdst = 0; | |
| 54 | ||
| 55 | rcu_read_lock(); | |
| 56 | indev = __in_dev_get_rcu(skb->dev); | |
| 57 | if (indev != NULL) { | |
| 58 | ifa = indev->ifa_list; | |
| 59 | newdst = ifa->ifa_local; | |
| 60 | } | |
| 61 | rcu_read_unlock(); | |
| 62 | ||
| 63 | if (!newdst) | |
| 64 | return NF_DROP; | |
| 65 | } | |
| 66 | ||
| 67 | /* Transfer from original range. */ | |
| 68 | memset(&newrange.min_addr, 0, sizeof(newrange.min_addr)); | |
| 69 | memset(&newrange.max_addr, 0, sizeof(newrange.max_addr)); | |
| 70 | newrange.flags = mr->range[0].flags | NF_NAT_RANGE_MAP_IPS; | |
| 71 | newrange.min_addr.ip = newdst; | |
| 72 | newrange.max_addr.ip = newdst; | |
| 73 | newrange.min_proto = mr->range[0].min; | |
| 74 | newrange.max_proto = mr->range[0].max; | |
| 75 | ||
| 76 | /* Hand modified range to generic setup. */ | |
| 77 | return nf_nat_setup_info(ct, &newrange, NF_NAT_MANIP_DST); | |
| 78 | } | |
| 79 | EXPORT_SYMBOL_GPL(nf_nat_redirect_ipv4); | |
| 80 | ||
| 81 | MODULE_LICENSE("GPL"); | |
| 82 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |