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Diffstat (limited to 'net/ipv4/netfilter/ip_nat_standalone.c')
-rw-r--r--net/ipv4/netfilter/ip_nat_standalone.c388
1 files changed, 0 insertions, 388 deletions
diff --git a/net/ipv4/netfilter/ip_nat_standalone.c b/net/ipv4/netfilter/ip_nat_standalone.c
deleted file mode 100644
index 6bcfdf6dfcc..00000000000
--- a/net/ipv4/netfilter/ip_nat_standalone.c
+++ /dev/null
@@ -1,388 +0,0 @@
-/* This file contains all the functions required for the standalone
- ip_nat module.
-
- These are not required by the compatibility layer.
-*/
-
-/* (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.
- */
-
-/*
- * 23 Apr 2001: Harald Welte <laforge@gnumonks.org>
- * - new API and handling of conntrack/nat helpers
- * - now capable of multiple expectations for one master
- * */
-
-#include <linux/types.h>
-#include <linux/icmp.h>
-#include <linux/ip.h>
-#include <linux/netfilter.h>
-#include <linux/netfilter_ipv4.h>
-#include <linux/module.h>
-#include <linux/skbuff.h>
-#include <linux/proc_fs.h>
-#include <net/ip.h>
-#include <net/checksum.h>
-#include <linux/spinlock.h>
-
-#include <linux/netfilter_ipv4/ip_nat.h>
-#include <linux/netfilter_ipv4/ip_nat_rule.h>
-#include <linux/netfilter_ipv4/ip_nat_protocol.h>
-#include <linux/netfilter_ipv4/ip_nat_core.h>
-#include <linux/netfilter_ipv4/ip_nat_helper.h>
-#include <linux/netfilter_ipv4/ip_tables.h>
-#include <linux/netfilter_ipv4/ip_conntrack_core.h>
-
-#if 0
-#define DEBUGP printk
-#else
-#define DEBUGP(format, args...)
-#endif
-
-#ifdef CONFIG_XFRM
-static void nat_decode_session(struct sk_buff *skb, struct flowi *fl)
-{
- struct ip_conntrack *ct;
- struct ip_conntrack_tuple *t;
- enum ip_conntrack_info ctinfo;
- enum ip_conntrack_dir dir;
- unsigned long statusbit;
-
- ct = ip_conntrack_get(skb, &ctinfo);
- if (ct == NULL)
- return;
- dir = CTINFO2DIR(ctinfo);
- t = &ct->tuplehash[dir].tuple;
-
- if (dir == IP_CT_DIR_ORIGINAL)
- statusbit = IPS_DST_NAT;
- else
- statusbit = IPS_SRC_NAT;
-
- if (ct->status & statusbit) {
- fl->fl4_dst = t->dst.ip;
- if (t->dst.protonum == IPPROTO_TCP ||
- t->dst.protonum == IPPROTO_UDP)
- fl->fl_ip_dport = t->dst.u.tcp.port;
- }
-
- statusbit ^= IPS_NAT_MASK;
-
- if (ct->status & statusbit) {
- fl->fl4_src = t->src.ip;
- if (t->dst.protonum == IPPROTO_TCP ||
- t->dst.protonum == IPPROTO_UDP)
- fl->fl_ip_sport = t->src.u.tcp.port;
- }
-}
-#endif
-
-static unsigned int
-ip_nat_fn(unsigned int hooknum,
- struct sk_buff **pskb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
-{
- struct ip_conntrack *ct;
- enum ip_conntrack_info ctinfo;
- struct ip_nat_info *info;
- /* maniptype == SRC for postrouting. */
- enum ip_nat_manip_type maniptype = HOOK2MANIP(hooknum);
-
- /* We never see fragments: conntrack defrags on pre-routing
- and local-out, and ip_nat_out protects post-routing. */
- IP_NF_ASSERT(!((*pskb)->nh.iph->frag_off
- & htons(IP_MF|IP_OFFSET)));
-
- ct = ip_conntrack_get(*pskb, &ctinfo);
- /* Can't track? It's not due to stress, or conntrack would
- have dropped it. Hence it's the user's responsibilty to
- packet filter it out, or implement conntrack/NAT for that
- protocol. 8) --RR */
- if (!ct) {
- /* Exception: ICMP redirect to new connection (not in
- hash table yet). We must not let this through, in
- case we're doing NAT to the same network. */
- if ((*pskb)->nh.iph->protocol == IPPROTO_ICMP) {
- struct icmphdr _hdr, *hp;
-
- hp = skb_header_pointer(*pskb,
- (*pskb)->nh.iph->ihl*4,
- sizeof(_hdr), &_hdr);
- if (hp != NULL &&
- hp->type == ICMP_REDIRECT)
- return NF_DROP;
- }
- return NF_ACCEPT;
- }
-
- /* Don't try to NAT if this packet is not conntracked */
- if (ct == &ip_conntrack_untracked)
- return NF_ACCEPT;
-
- switch (ctinfo) {
- case IP_CT_RELATED:
- case IP_CT_RELATED+IP_CT_IS_REPLY:
- if ((*pskb)->nh.iph->protocol == IPPROTO_ICMP) {
- if (!ip_nat_icmp_reply_translation(ct, ctinfo,
- hooknum, pskb))
- return NF_DROP;
- else
- return NF_ACCEPT;
- }
- /* Fall thru... (Only ICMPs can be IP_CT_IS_REPLY) */
- case IP_CT_NEW:
- info = &ct->nat.info;
-
- /* Seen it before? This can happen for loopback, retrans,
- or local packets.. */
- if (!ip_nat_initialized(ct, maniptype)) {
- unsigned int ret;
-
- if (unlikely(is_confirmed(ct)))
- /* NAT module was loaded late */
- ret = alloc_null_binding_confirmed(ct, info,
- hooknum);
- else if (hooknum == NF_IP_LOCAL_IN)
- /* LOCAL_IN hook doesn't have a chain! */
- ret = alloc_null_binding(ct, info, hooknum);
- else
- ret = ip_nat_rule_find(pskb, hooknum,
- in, out, ct,
- info);
-
- if (ret != NF_ACCEPT) {
- return ret;
- }
- } else
- DEBUGP("Already setup manip %s for ct %p\n",
- maniptype == IP_NAT_MANIP_SRC ? "SRC" : "DST",
- ct);
- break;
-
- default:
- /* ESTABLISHED */
- IP_NF_ASSERT(ctinfo == IP_CT_ESTABLISHED
- || ctinfo == (IP_CT_ESTABLISHED+IP_CT_IS_REPLY));
- info = &ct->nat.info;
- }
-
- IP_NF_ASSERT(info);
- return ip_nat_packet(ct, ctinfo, hooknum, pskb);
-}
-
-static unsigned int
-ip_nat_in(unsigned int hooknum,
- struct sk_buff **pskb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
-{
- unsigned int ret;
- __be32 daddr = (*pskb)->nh.iph->daddr;
-
- ret = ip_nat_fn(hooknum, pskb, in, out, okfn);
- if (ret != NF_DROP && ret != NF_STOLEN
- && daddr != (*pskb)->nh.iph->daddr) {
- dst_release((*pskb)->dst);
- (*pskb)->dst = NULL;
- }
- return ret;
-}
-
-static unsigned int
-ip_nat_out(unsigned int hooknum,
- struct sk_buff **pskb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
-{
-#ifdef CONFIG_XFRM
- struct ip_conntrack *ct;
- enum ip_conntrack_info ctinfo;
-#endif
- unsigned int ret;
-
- /* root is playing with raw sockets. */
- if ((*pskb)->len < sizeof(struct iphdr)
- || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr))
- return NF_ACCEPT;
-
- ret = ip_nat_fn(hooknum, pskb, in, out, okfn);
-#ifdef CONFIG_XFRM
- if (ret != NF_DROP && ret != NF_STOLEN
- && (ct = ip_conntrack_get(*pskb, &ctinfo)) != NULL) {
- enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
-
- if (ct->tuplehash[dir].tuple.src.ip !=
- ct->tuplehash[!dir].tuple.dst.ip
- || ct->tuplehash[dir].tuple.src.u.all !=
- ct->tuplehash[!dir].tuple.dst.u.all
- )
- return ip_xfrm_me_harder(pskb) == 0 ? ret : NF_DROP;
- }
-#endif
- return ret;
-}
-
-static unsigned int
-ip_nat_local_fn(unsigned int hooknum,
- struct sk_buff **pskb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
-{
- struct ip_conntrack *ct;
- enum ip_conntrack_info ctinfo;
- unsigned int ret;
-
- /* root is playing with raw sockets. */
- if ((*pskb)->len < sizeof(struct iphdr)
- || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr))
- return NF_ACCEPT;
-
- ret = ip_nat_fn(hooknum, pskb, in, out, okfn);
- if (ret != NF_DROP && ret != NF_STOLEN
- && (ct = ip_conntrack_get(*pskb, &ctinfo)) != NULL) {
- enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
-
- if (ct->tuplehash[dir].tuple.dst.ip !=
- ct->tuplehash[!dir].tuple.src.ip) {
- if (ip_route_me_harder(pskb, RTN_UNSPEC))
- ret = NF_DROP;
- }
-#ifdef CONFIG_XFRM
- else if (ct->tuplehash[dir].tuple.dst.u.all !=
- ct->tuplehash[!dir].tuple.src.u.all)
- if (ip_xfrm_me_harder(pskb))
- ret = NF_DROP;
-#endif
-
- }
- return ret;
-}
-
-static unsigned int
-ip_nat_adjust(unsigned int hooknum,
- struct sk_buff **pskb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
-{
- struct ip_conntrack *ct;
- enum ip_conntrack_info ctinfo;
-
- ct = ip_conntrack_get(*pskb, &ctinfo);
- if (ct && test_bit(IPS_SEQ_ADJUST_BIT, &ct->status)) {
- DEBUGP("ip_nat_standalone: adjusting sequence number\n");
- if (!ip_nat_seq_adjust(pskb, ct, ctinfo))
- return NF_DROP;
- }
- return NF_ACCEPT;
-}
-
-/* We must be after connection tracking and before packet filtering. */
-
-static struct nf_hook_ops ip_nat_ops[] = {
- /* Before packet filtering, change destination */
- {
- .hook = ip_nat_in,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_PRE_ROUTING,
- .priority = NF_IP_PRI_NAT_DST,
- },
- /* After packet filtering, change source */
- {
- .hook = ip_nat_out,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_POST_ROUTING,
- .priority = NF_IP_PRI_NAT_SRC,
- },
- /* After conntrack, adjust sequence number */
- {
- .hook = ip_nat_adjust,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_POST_ROUTING,
- .priority = NF_IP_PRI_NAT_SEQ_ADJUST,
- },
- /* Before packet filtering, change destination */
- {
- .hook = ip_nat_local_fn,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_LOCAL_OUT,
- .priority = NF_IP_PRI_NAT_DST,
- },
- /* After packet filtering, change source */
- {
- .hook = ip_nat_fn,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_LOCAL_IN,
- .priority = NF_IP_PRI_NAT_SRC,
- },
- /* After conntrack, adjust sequence number */
- {
- .hook = ip_nat_adjust,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_LOCAL_IN,
- .priority = NF_IP_PRI_NAT_SEQ_ADJUST,
- },
-};
-
-static int __init ip_nat_standalone_init(void)
-{
- int ret = 0;
-
- need_conntrack();
-
-#ifdef CONFIG_XFRM
- BUG_ON(ip_nat_decode_session != NULL);
- ip_nat_decode_session = nat_decode_session;
-#endif
- ret = ip_nat_rule_init();
- if (ret < 0) {
- printk("ip_nat_init: can't setup rules.\n");
- goto cleanup_decode_session;
- }
- ret = nf_register_hooks(ip_nat_ops, ARRAY_SIZE(ip_nat_ops));
- if (ret < 0) {
- printk("ip_nat_init: can't register hooks.\n");
- goto cleanup_rule_init;
- }
- return ret;
-
- cleanup_rule_init:
- ip_nat_rule_cleanup();
- cleanup_decode_session:
-#ifdef CONFIG_XFRM
- ip_nat_decode_session = NULL;
- synchronize_net();
-#endif
- return ret;
-}
-
-static void __exit ip_nat_standalone_fini(void)
-{
- nf_unregister_hooks(ip_nat_ops, ARRAY_SIZE(ip_nat_ops));
- ip_nat_rule_cleanup();
-#ifdef CONFIG_XFRM
- ip_nat_decode_session = NULL;
- synchronize_net();
-#endif
-}
-
-module_init(ip_nat_standalone_init);
-module_exit(ip_nat_standalone_fini);
-
-MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-02 00:38:55 +0000