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path: root/net/ipv4/netfilter/ip_nat_rule.c
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Diffstat (limited to 'net/ipv4/netfilter/ip_nat_rule.c')
-rw-r--r--net/ipv4/netfilter/ip_nat_rule.c314
1 files changed, 0 insertions, 314 deletions
diff --git a/net/ipv4/netfilter/ip_nat_rule.c b/net/ipv4/netfilter/ip_nat_rule.c
deleted file mode 100644
index 080eb1d9220..00000000000
--- a/net/ipv4/netfilter/ip_nat_rule.c
+++ /dev/null
@@ -1,314 +0,0 @@
-/* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2004 Netfilter Core Team <coreteam@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.
- */
-
-/* Everything about the rules for NAT. */
-#include <linux/types.h>
-#include <linux/ip.h>
-#include <linux/netfilter.h>
-#include <linux/netfilter_ipv4.h>
-#include <linux/module.h>
-#include <linux/kmod.h>
-#include <linux/skbuff.h>
-#include <linux/proc_fs.h>
-#include <net/checksum.h>
-#include <net/route.h>
-#include <linux/bitops.h>
-
-#include <linux/netfilter_ipv4/ip_tables.h>
-#include <linux/netfilter_ipv4/ip_nat.h>
-#include <linux/netfilter_ipv4/ip_nat_core.h>
-#include <linux/netfilter_ipv4/ip_nat_rule.h>
-
-#if 0
-#define DEBUGP printk
-#else
-#define DEBUGP(format, args...)
-#endif
-
-#define NAT_VALID_HOOKS ((1<<NF_IP_PRE_ROUTING) | (1<<NF_IP_POST_ROUTING) | (1<<NF_IP_LOCAL_OUT))
-
-static struct
-{
- struct ipt_replace repl;
- struct ipt_standard entries[3];
- struct ipt_error term;
-} nat_initial_table __initdata
-= { { "nat", NAT_VALID_HOOKS, 4,
- sizeof(struct ipt_standard) * 3 + sizeof(struct ipt_error),
- { [NF_IP_PRE_ROUTING] = 0,
- [NF_IP_POST_ROUTING] = sizeof(struct ipt_standard),
- [NF_IP_LOCAL_OUT] = sizeof(struct ipt_standard) * 2 },
- { [NF_IP_PRE_ROUTING] = 0,
- [NF_IP_POST_ROUTING] = sizeof(struct ipt_standard),
- [NF_IP_LOCAL_OUT] = sizeof(struct ipt_standard) * 2 },
- 0, NULL, { } },
- {
- /* PRE_ROUTING */
- { { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
- 0,
- sizeof(struct ipt_entry),
- sizeof(struct ipt_standard),
- 0, { 0, 0 }, { } },
- { { { { IPT_ALIGN(sizeof(struct ipt_standard_target)), "" } }, { } },
- -NF_ACCEPT - 1 } },
- /* POST_ROUTING */
- { { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
- 0,
- sizeof(struct ipt_entry),
- sizeof(struct ipt_standard),
- 0, { 0, 0 }, { } },
- { { { { IPT_ALIGN(sizeof(struct ipt_standard_target)), "" } }, { } },
- -NF_ACCEPT - 1 } },
- /* LOCAL_OUT */
- { { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
- 0,
- sizeof(struct ipt_entry),
- sizeof(struct ipt_standard),
- 0, { 0, 0 }, { } },
- { { { { IPT_ALIGN(sizeof(struct ipt_standard_target)), "" } }, { } },
- -NF_ACCEPT - 1 } }
- },
- /* ERROR */
- { { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
- 0,
- sizeof(struct ipt_entry),
- sizeof(struct ipt_error),
- 0, { 0, 0 }, { } },
- { { { { IPT_ALIGN(sizeof(struct ipt_error_target)), IPT_ERROR_TARGET } },
- { } },
- "ERROR"
- }
- }
-};
-
-static struct xt_table nat_table = {
- .name = "nat",
- .valid_hooks = NAT_VALID_HOOKS,
- .lock = RW_LOCK_UNLOCKED,
- .me = THIS_MODULE,
- .af = AF_INET,
-};
-
-/* Source NAT */
-static unsigned int ipt_snat_target(struct sk_buff **pskb,
- const struct net_device *in,
- const struct net_device *out,
- unsigned int hooknum,
- const struct xt_target *target,
- const void *targinfo)
-{
- struct ip_conntrack *ct;
- enum ip_conntrack_info ctinfo;
- const struct ip_nat_multi_range_compat *mr = targinfo;
-
- IP_NF_ASSERT(hooknum == NF_IP_POST_ROUTING);
-
- ct = ip_conntrack_get(*pskb, &ctinfo);
-
- /* Connection must be valid and new. */
- IP_NF_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED
- || ctinfo == IP_CT_RELATED + IP_CT_IS_REPLY));
- IP_NF_ASSERT(out);
-
- return ip_nat_setup_info(ct, &mr->range[0], hooknum);
-}
-
-/* Before 2.6.11 we did implicit source NAT if required. Warn about change. */
-static void warn_if_extra_mangle(__be32 dstip, __be32 srcip)
-{
- static int warned = 0;
- struct flowi fl = { .nl_u = { .ip4_u = { .daddr = dstip } } };
- struct rtable *rt;
-
- if (ip_route_output_key(&rt, &fl) != 0)
- return;
-
- if (rt->rt_src != srcip && !warned) {
- printk("NAT: no longer support implicit source local NAT\n");
- printk("NAT: packet src %u.%u.%u.%u -> dst %u.%u.%u.%u\n",
- NIPQUAD(srcip), NIPQUAD(dstip));
- warned = 1;
- }
- ip_rt_put(rt);
-}
-
-static unsigned int ipt_dnat_target(struct sk_buff **pskb,
- const struct net_device *in,
- const struct net_device *out,
- unsigned int hooknum,
- const struct xt_target *target,
- const void *targinfo)
-{
- struct ip_conntrack *ct;
- enum ip_conntrack_info ctinfo;
- const struct ip_nat_multi_range_compat *mr = targinfo;
-
- IP_NF_ASSERT(hooknum == NF_IP_PRE_ROUTING
- || hooknum == NF_IP_LOCAL_OUT);
-
- ct = ip_conntrack_get(*pskb, &ctinfo);
-
- /* Connection must be valid and new. */
- IP_NF_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED));
-
- if (hooknum == NF_IP_LOCAL_OUT
- && mr->range[0].flags & IP_NAT_RANGE_MAP_IPS)
- warn_if_extra_mangle((*pskb)->nh.iph->daddr,
- mr->range[0].min_ip);
-
- return ip_nat_setup_info(ct, &mr->range[0], hooknum);
-}
-
-static int ipt_snat_checkentry(const char *tablename,
- const void *entry,
- const struct xt_target *target,
- void *targinfo,
- unsigned int hook_mask)
-{
- struct ip_nat_multi_range_compat *mr = targinfo;
-
- /* Must be a valid range */
- if (mr->rangesize != 1) {
- printk("SNAT: multiple ranges no longer supported\n");
- return 0;
- }
- return 1;
-}
-
-static int ipt_dnat_checkentry(const char *tablename,
- const void *entry,
- const struct xt_target *target,
- void *targinfo,
- unsigned int hook_mask)
-{
- struct ip_nat_multi_range_compat *mr = targinfo;
-
- /* Must be a valid range */
- if (mr->rangesize != 1) {
- printk("DNAT: multiple ranges no longer supported\n");
- return 0;
- }
- if (mr->range[0].flags & IP_NAT_RANGE_PROTO_RANDOM) {
- printk("DNAT: port randomization not supported\n");
- return 0;
- }
- return 1;
-}
-
-inline unsigned int
-alloc_null_binding(struct ip_conntrack *conntrack,
- struct ip_nat_info *info,
- unsigned int hooknum)
-{
- /* Force range to this IP; let proto decide mapping for
- per-proto parts (hence not IP_NAT_RANGE_PROTO_SPECIFIED).
- Use reply in case it's already been mangled (eg local packet).
- */
- __be32 ip
- = (HOOK2MANIP(hooknum) == IP_NAT_MANIP_SRC
- ? conntrack->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip
- : conntrack->tuplehash[IP_CT_DIR_REPLY].tuple.src.ip);
- struct ip_nat_range range
- = { IP_NAT_RANGE_MAP_IPS, ip, ip, { 0 }, { 0 } };
-
- DEBUGP("Allocating NULL binding for %p (%u.%u.%u.%u)\n", conntrack,
- NIPQUAD(ip));
- return ip_nat_setup_info(conntrack, &range, hooknum);
-}
-
-unsigned int
-alloc_null_binding_confirmed(struct ip_conntrack *conntrack,
- struct ip_nat_info *info,
- unsigned int hooknum)
-{
- __be32 ip
- = (HOOK2MANIP(hooknum) == IP_NAT_MANIP_SRC
- ? conntrack->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip
- : conntrack->tuplehash[IP_CT_DIR_REPLY].tuple.src.ip);
- u_int16_t all
- = (HOOK2MANIP(hooknum) == IP_NAT_MANIP_SRC
- ? conntrack->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u.all
- : conntrack->tuplehash[IP_CT_DIR_REPLY].tuple.src.u.all);
- struct ip_nat_range range
- = { IP_NAT_RANGE_MAP_IPS, ip, ip, { all }, { all } };
-
- DEBUGP("Allocating NULL binding for confirmed %p (%u.%u.%u.%u)\n",
- conntrack, NIPQUAD(ip));
- return ip_nat_setup_info(conntrack, &range, hooknum);
-}
-
-int ip_nat_rule_find(struct sk_buff **pskb,
- unsigned int hooknum,
- const struct net_device *in,
- const struct net_device *out,
- struct ip_conntrack *ct,
- struct ip_nat_info *info)
-{
- int ret;
-
- ret = ipt_do_table(pskb, hooknum, in, out, &nat_table);
-
- if (ret == NF_ACCEPT) {
- if (!ip_nat_initialized(ct, HOOK2MANIP(hooknum)))
- /* NUL mapping */
- ret = alloc_null_binding(ct, info, hooknum);
- }
- return ret;
-}
-
-static struct xt_target ipt_snat_reg = {
- .name = "SNAT",
- .family = AF_INET,
- .target = ipt_snat_target,
- .targetsize = sizeof(struct ip_nat_multi_range_compat),
- .table = "nat",
- .hooks = 1 << NF_IP_POST_ROUTING,
- .checkentry = ipt_snat_checkentry,
-};
-
-static struct xt_target ipt_dnat_reg = {
- .name = "DNAT",
- .family = AF_INET,
- .target = ipt_dnat_target,
- .targetsize = sizeof(struct ip_nat_multi_range_compat),
- .table = "nat",
- .hooks = (1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_LOCAL_OUT),
- .checkentry = ipt_dnat_checkentry,
-};
-
-int __init ip_nat_rule_init(void)
-{
- int ret;
-
- ret = ipt_register_table(&nat_table, &nat_initial_table.repl);
- if (ret != 0)
- return ret;
- ret = xt_register_target(&ipt_snat_reg);
- if (ret != 0)
- goto unregister_table;
-
- ret = xt_register_target(&ipt_dnat_reg);
- if (ret != 0)
- goto unregister_snat;
-
- return ret;
-
- unregister_snat:
- xt_unregister_target(&ipt_snat_reg);
- unregister_table:
- xt_unregister_table(&nat_table);
-
- return ret;
-}
-
-void ip_nat_rule_cleanup(void)
-{
- xt_unregister_target(&ipt_dnat_reg);
- xt_unregister_target(&ipt_snat_reg);
- ipt_unregister_table(&nat_table);
-}
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