mirror of
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572 lines
15 KiB
C
572 lines
15 KiB
C
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/* (C) 1999-2001 Paul `Rusty' Russell
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* (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
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* - move L3 protocol dependent part to this file.
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* 23 Mar 2004: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
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* - add get_features() to support various size of conntrack
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* structures.
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*
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* Derived from net/ipv4/netfilter/ip_conntrack_standalone.c
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*/
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#include <linux/config.h>
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#include <linux/types.h>
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#include <linux/ip.h>
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#include <linux/netfilter.h>
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/icmp.h>
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#include <linux/sysctl.h>
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#include <net/ip.h>
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#include <linux/netfilter_ipv4.h>
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#include <net/netfilter/nf_conntrack.h>
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#include <net/netfilter/nf_conntrack_helper.h>
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#include <net/netfilter/nf_conntrack_protocol.h>
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#include <net/netfilter/nf_conntrack_l3proto.h>
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#include <net/netfilter/nf_conntrack_core.h>
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#include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
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#if 0
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#define DEBUGP printk
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#else
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#define DEBUGP(format, args...)
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#endif
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DECLARE_PER_CPU(struct nf_conntrack_stat, nf_conntrack_stat);
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static int ipv4_pkt_to_tuple(const struct sk_buff *skb, unsigned int nhoff,
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struct nf_conntrack_tuple *tuple)
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{
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u_int32_t _addrs[2], *ap;
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ap = skb_header_pointer(skb, nhoff + offsetof(struct iphdr, saddr),
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sizeof(u_int32_t) * 2, _addrs);
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if (ap == NULL)
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return 0;
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tuple->src.u3.ip = ap[0];
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tuple->dst.u3.ip = ap[1];
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return 1;
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}
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static int ipv4_invert_tuple(struct nf_conntrack_tuple *tuple,
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const struct nf_conntrack_tuple *orig)
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{
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tuple->src.u3.ip = orig->dst.u3.ip;
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tuple->dst.u3.ip = orig->src.u3.ip;
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return 1;
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}
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static int ipv4_print_tuple(struct seq_file *s,
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const struct nf_conntrack_tuple *tuple)
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{
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return seq_printf(s, "src=%u.%u.%u.%u dst=%u.%u.%u.%u ",
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NIPQUAD(tuple->src.u3.ip),
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NIPQUAD(tuple->dst.u3.ip));
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}
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static int ipv4_print_conntrack(struct seq_file *s,
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const struct nf_conn *conntrack)
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{
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return 0;
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}
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/* Returns new sk_buff, or NULL */
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static struct sk_buff *
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nf_ct_ipv4_gather_frags(struct sk_buff *skb, u_int32_t user)
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{
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skb_orphan(skb);
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local_bh_disable();
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skb = ip_defrag(skb, user);
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local_bh_enable();
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if (skb)
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ip_send_check(skb->nh.iph);
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return skb;
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}
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static int
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ipv4_prepare(struct sk_buff **pskb, unsigned int hooknum, unsigned int *dataoff,
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u_int8_t *protonum)
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{
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/* Never happen */
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if ((*pskb)->nh.iph->frag_off & htons(IP_OFFSET)) {
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if (net_ratelimit()) {
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printk(KERN_ERR "ipv4_prepare: Frag of proto %u (hook=%u)\n",
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(*pskb)->nh.iph->protocol, hooknum);
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}
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return -NF_DROP;
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}
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*dataoff = (*pskb)->nh.raw - (*pskb)->data + (*pskb)->nh.iph->ihl*4;
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*protonum = (*pskb)->nh.iph->protocol;
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return NF_ACCEPT;
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}
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int nat_module_is_loaded = 0;
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static u_int32_t ipv4_get_features(const struct nf_conntrack_tuple *tuple)
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{
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if (nat_module_is_loaded)
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return NF_CT_F_NAT;
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return NF_CT_F_BASIC;
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}
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static unsigned int ipv4_confirm(unsigned int hooknum,
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struct sk_buff **pskb,
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const struct net_device *in,
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const struct net_device *out,
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int (*okfn)(struct sk_buff *))
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{
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/* We've seen it coming out the other side: confirm it */
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return nf_conntrack_confirm(pskb);
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}
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static unsigned int ipv4_conntrack_help(unsigned int hooknum,
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struct sk_buff **pskb,
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const struct net_device *in,
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const struct net_device *out,
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int (*okfn)(struct sk_buff *))
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{
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struct nf_conn *ct;
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enum ip_conntrack_info ctinfo;
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/* This is where we call the helper: as the packet goes out. */
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ct = nf_ct_get(*pskb, &ctinfo);
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if (ct && ct->helper) {
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unsigned int ret;
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ret = ct->helper->help(pskb,
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(*pskb)->nh.raw - (*pskb)->data
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+ (*pskb)->nh.iph->ihl*4,
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ct, ctinfo);
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if (ret != NF_ACCEPT)
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return ret;
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}
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return NF_ACCEPT;
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}
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static unsigned int ipv4_conntrack_defrag(unsigned int hooknum,
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struct sk_buff **pskb,
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const struct net_device *in,
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const struct net_device *out,
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int (*okfn)(struct sk_buff *))
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{
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#if !defined(CONFIG_IP_NF_NAT) && !defined(CONFIG_IP_NF_NAT_MODULE)
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/* Previously seen (loopback)? Ignore. Do this before
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fragment check. */
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if ((*pskb)->nfct)
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return NF_ACCEPT;
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#endif
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/* Gather fragments. */
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if ((*pskb)->nh.iph->frag_off & htons(IP_MF|IP_OFFSET)) {
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*pskb = nf_ct_ipv4_gather_frags(*pskb,
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hooknum == NF_IP_PRE_ROUTING ?
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IP_DEFRAG_CONNTRACK_IN :
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IP_DEFRAG_CONNTRACK_OUT);
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if (!*pskb)
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return NF_STOLEN;
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}
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return NF_ACCEPT;
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}
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static unsigned int ipv4_refrag(unsigned int hooknum,
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struct sk_buff **pskb,
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const struct net_device *in,
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const struct net_device *out,
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int (*okfn)(struct sk_buff *))
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{
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struct rtable *rt = (struct rtable *)(*pskb)->dst;
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/* We've seen it coming out the other side: confirm */
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if (ipv4_confirm(hooknum, pskb, in, out, okfn) != NF_ACCEPT)
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return NF_DROP;
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/* Local packets are never produced too large for their
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interface. We degfragment them at LOCAL_OUT, however,
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so we have to refragment them here. */
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if ((*pskb)->len > dst_mtu(&rt->u.dst) &&
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!skb_shinfo(*pskb)->tso_size) {
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/* No hook can be after us, so this should be OK. */
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ip_fragment(*pskb, okfn);
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return NF_STOLEN;
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}
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return NF_ACCEPT;
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}
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static unsigned int ipv4_conntrack_in(unsigned int hooknum,
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struct sk_buff **pskb,
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const struct net_device *in,
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const struct net_device *out,
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int (*okfn)(struct sk_buff *))
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{
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return nf_conntrack_in(PF_INET, hooknum, pskb);
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}
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static unsigned int ipv4_conntrack_local(unsigned int hooknum,
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struct sk_buff **pskb,
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const struct net_device *in,
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const struct net_device *out,
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int (*okfn)(struct sk_buff *))
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{
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/* root is playing with raw sockets. */
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if ((*pskb)->len < sizeof(struct iphdr)
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|| (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr)) {
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if (net_ratelimit())
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printk("ipt_hook: happy cracking.\n");
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return NF_ACCEPT;
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}
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return nf_conntrack_in(PF_INET, hooknum, pskb);
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}
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/* Connection tracking may drop packets, but never alters them, so
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make it the first hook. */
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static struct nf_hook_ops ipv4_conntrack_defrag_ops = {
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.hook = ipv4_conntrack_defrag,
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.owner = THIS_MODULE,
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.pf = PF_INET,
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.hooknum = NF_IP_PRE_ROUTING,
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.priority = NF_IP_PRI_CONNTRACK_DEFRAG,
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};
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static struct nf_hook_ops ipv4_conntrack_in_ops = {
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.hook = ipv4_conntrack_in,
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.owner = THIS_MODULE,
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.pf = PF_INET,
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.hooknum = NF_IP_PRE_ROUTING,
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.priority = NF_IP_PRI_CONNTRACK,
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};
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static struct nf_hook_ops ipv4_conntrack_defrag_local_out_ops = {
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.hook = ipv4_conntrack_defrag,
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.owner = THIS_MODULE,
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.pf = PF_INET,
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.hooknum = NF_IP_LOCAL_OUT,
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.priority = NF_IP_PRI_CONNTRACK_DEFRAG,
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};
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static struct nf_hook_ops ipv4_conntrack_local_out_ops = {
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.hook = ipv4_conntrack_local,
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.owner = THIS_MODULE,
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.pf = PF_INET,
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.hooknum = NF_IP_LOCAL_OUT,
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.priority = NF_IP_PRI_CONNTRACK,
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};
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/* helpers */
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static struct nf_hook_ops ipv4_conntrack_helper_out_ops = {
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.hook = ipv4_conntrack_help,
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.owner = THIS_MODULE,
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.pf = PF_INET,
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.hooknum = NF_IP_POST_ROUTING,
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.priority = NF_IP_PRI_CONNTRACK_HELPER,
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};
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static struct nf_hook_ops ipv4_conntrack_helper_in_ops = {
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.hook = ipv4_conntrack_help,
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.owner = THIS_MODULE,
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.pf = PF_INET,
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.hooknum = NF_IP_LOCAL_IN,
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.priority = NF_IP_PRI_CONNTRACK_HELPER,
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};
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/* Refragmenter; last chance. */
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static struct nf_hook_ops ipv4_conntrack_out_ops = {
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.hook = ipv4_refrag,
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.owner = THIS_MODULE,
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.pf = PF_INET,
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.hooknum = NF_IP_POST_ROUTING,
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.priority = NF_IP_PRI_CONNTRACK_CONFIRM,
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};
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static struct nf_hook_ops ipv4_conntrack_local_in_ops = {
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.hook = ipv4_confirm,
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.owner = THIS_MODULE,
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.pf = PF_INET,
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.hooknum = NF_IP_LOCAL_IN,
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.priority = NF_IP_PRI_CONNTRACK_CONFIRM,
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};
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#ifdef CONFIG_SYSCTL
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/* From nf_conntrack_proto_icmp.c */
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extern unsigned long nf_ct_icmp_timeout;
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static struct ctl_table_header *nf_ct_ipv4_sysctl_header;
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static ctl_table nf_ct_sysctl_table[] = {
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{
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.ctl_name = NET_NF_CONNTRACK_ICMP_TIMEOUT,
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.procname = "nf_conntrack_icmp_timeout",
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.data = &nf_ct_icmp_timeout,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = &proc_dointvec_jiffies,
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},
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{ .ctl_name = 0 }
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};
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static ctl_table nf_ct_netfilter_table[] = {
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{
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.ctl_name = NET_NETFILTER,
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.procname = "netfilter",
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.mode = 0555,
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.child = nf_ct_sysctl_table,
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},
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{ .ctl_name = 0 }
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};
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static ctl_table nf_ct_net_table[] = {
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{
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.ctl_name = CTL_NET,
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.procname = "net",
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.mode = 0555,
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.child = nf_ct_netfilter_table,
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},
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{ .ctl_name = 0 }
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};
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#endif
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/* Fast function for those who don't want to parse /proc (and I don't
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blame them). */
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/* Reversing the socket's dst/src point of view gives us the reply
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mapping. */
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static int
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getorigdst(struct sock *sk, int optval, void __user *user, int *len)
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{
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struct inet_sock *inet = inet_sk(sk);
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struct nf_conntrack_tuple_hash *h;
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struct nf_conntrack_tuple tuple;
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NF_CT_TUPLE_U_BLANK(&tuple);
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tuple.src.u3.ip = inet->rcv_saddr;
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tuple.src.u.tcp.port = inet->sport;
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tuple.dst.u3.ip = inet->daddr;
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tuple.dst.u.tcp.port = inet->dport;
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tuple.src.l3num = PF_INET;
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tuple.dst.protonum = IPPROTO_TCP;
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/* We only do TCP at the moment: is there a better way? */
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if (strcmp(sk->sk_prot->name, "TCP")) {
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DEBUGP("SO_ORIGINAL_DST: Not a TCP socket\n");
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return -ENOPROTOOPT;
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}
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if ((unsigned int) *len < sizeof(struct sockaddr_in)) {
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DEBUGP("SO_ORIGINAL_DST: len %u not %u\n",
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*len, sizeof(struct sockaddr_in));
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return -EINVAL;
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}
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h = nf_conntrack_find_get(&tuple, NULL);
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if (h) {
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struct sockaddr_in sin;
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struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
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sin.sin_family = AF_INET;
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sin.sin_port = ct->tuplehash[IP_CT_DIR_ORIGINAL]
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.tuple.dst.u.tcp.port;
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sin.sin_addr.s_addr = ct->tuplehash[IP_CT_DIR_ORIGINAL]
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.tuple.dst.u3.ip;
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DEBUGP("SO_ORIGINAL_DST: %u.%u.%u.%u %u\n",
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NIPQUAD(sin.sin_addr.s_addr), ntohs(sin.sin_port));
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nf_ct_put(ct);
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if (copy_to_user(user, &sin, sizeof(sin)) != 0)
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return -EFAULT;
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else
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return 0;
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}
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DEBUGP("SO_ORIGINAL_DST: Can't find %u.%u.%u.%u/%u-%u.%u.%u.%u/%u.\n",
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NIPQUAD(tuple.src.u3.ip), ntohs(tuple.src.u.tcp.port),
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NIPQUAD(tuple.dst.u3.ip), ntohs(tuple.dst.u.tcp.port));
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return -ENOENT;
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}
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static struct nf_sockopt_ops so_getorigdst = {
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.pf = PF_INET,
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.get_optmin = SO_ORIGINAL_DST,
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.get_optmax = SO_ORIGINAL_DST+1,
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.get = &getorigdst,
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};
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struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv4 = {
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.l3proto = PF_INET,
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|
.name = "ipv4",
|
||
|
.pkt_to_tuple = ipv4_pkt_to_tuple,
|
||
|
.invert_tuple = ipv4_invert_tuple,
|
||
|
.print_tuple = ipv4_print_tuple,
|
||
|
.print_conntrack = ipv4_print_conntrack,
|
||
|
.prepare = ipv4_prepare,
|
||
|
.get_features = ipv4_get_features,
|
||
|
.me = THIS_MODULE,
|
||
|
};
|
||
|
|
||
|
extern struct nf_conntrack_protocol nf_conntrack_protocol_tcp4;
|
||
|
extern struct nf_conntrack_protocol nf_conntrack_protocol_udp4;
|
||
|
extern struct nf_conntrack_protocol nf_conntrack_protocol_icmp;
|
||
|
static int init_or_cleanup(int init)
|
||
|
{
|
||
|
int ret = 0;
|
||
|
|
||
|
if (!init) goto cleanup;
|
||
|
|
||
|
ret = nf_register_sockopt(&so_getorigdst);
|
||
|
if (ret < 0) {
|
||
|
printk(KERN_ERR "Unable to register netfilter socket option\n");
|
||
|
goto cleanup_nothing;
|
||
|
}
|
||
|
|
||
|
ret = nf_conntrack_protocol_register(&nf_conntrack_protocol_tcp4);
|
||
|
if (ret < 0) {
|
||
|
printk("nf_conntrack_ipv4: can't register tcp.\n");
|
||
|
goto cleanup_sockopt;
|
||
|
}
|
||
|
|
||
|
ret = nf_conntrack_protocol_register(&nf_conntrack_protocol_udp4);
|
||
|
if (ret < 0) {
|
||
|
printk("nf_conntrack_ipv4: can't register udp.\n");
|
||
|
goto cleanup_tcp;
|
||
|
}
|
||
|
|
||
|
ret = nf_conntrack_protocol_register(&nf_conntrack_protocol_icmp);
|
||
|
if (ret < 0) {
|
||
|
printk("nf_conntrack_ipv4: can't register icmp.\n");
|
||
|
goto cleanup_udp;
|
||
|
}
|
||
|
|
||
|
ret = nf_conntrack_l3proto_register(&nf_conntrack_l3proto_ipv4);
|
||
|
if (ret < 0) {
|
||
|
printk("nf_conntrack_ipv4: can't register ipv4\n");
|
||
|
goto cleanup_icmp;
|
||
|
}
|
||
|
|
||
|
ret = nf_register_hook(&ipv4_conntrack_defrag_ops);
|
||
|
if (ret < 0) {
|
||
|
printk("nf_conntrack_ipv4: can't register pre-routing defrag hook.\n");
|
||
|
goto cleanup_ipv4;
|
||
|
}
|
||
|
ret = nf_register_hook(&ipv4_conntrack_defrag_local_out_ops);
|
||
|
if (ret < 0) {
|
||
|
printk("nf_conntrack_ipv4: can't register local_out defrag hook.\n");
|
||
|
goto cleanup_defragops;
|
||
|
}
|
||
|
|
||
|
ret = nf_register_hook(&ipv4_conntrack_in_ops);
|
||
|
if (ret < 0) {
|
||
|
printk("nf_conntrack_ipv4: can't register pre-routing hook.\n");
|
||
|
goto cleanup_defraglocalops;
|
||
|
}
|
||
|
|
||
|
ret = nf_register_hook(&ipv4_conntrack_local_out_ops);
|
||
|
if (ret < 0) {
|
||
|
printk("nf_conntrack_ipv4: can't register local out hook.\n");
|
||
|
goto cleanup_inops;
|
||
|
}
|
||
|
|
||
|
ret = nf_register_hook(&ipv4_conntrack_helper_in_ops);
|
||
|
if (ret < 0) {
|
||
|
printk("nf_conntrack_ipv4: can't register local helper hook.\n");
|
||
|
goto cleanup_inandlocalops;
|
||
|
}
|
||
|
|
||
|
ret = nf_register_hook(&ipv4_conntrack_helper_out_ops);
|
||
|
if (ret < 0) {
|
||
|
printk("nf_conntrack_ipv4: can't register postrouting helper hook.\n");
|
||
|
goto cleanup_helperinops;
|
||
|
}
|
||
|
|
||
|
ret = nf_register_hook(&ipv4_conntrack_out_ops);
|
||
|
if (ret < 0) {
|
||
|
printk("nf_conntrack_ipv4: can't register post-routing hook.\n");
|
||
|
goto cleanup_helperoutops;
|
||
|
}
|
||
|
|
||
|
ret = nf_register_hook(&ipv4_conntrack_local_in_ops);
|
||
|
if (ret < 0) {
|
||
|
printk("nf_conntrack_ipv4: can't register local in hook.\n");
|
||
|
goto cleanup_inoutandlocalops;
|
||
|
}
|
||
|
|
||
|
#ifdef CONFIG_SYSCTL
|
||
|
nf_ct_ipv4_sysctl_header = register_sysctl_table(nf_ct_net_table, 0);
|
||
|
if (nf_ct_ipv4_sysctl_header == NULL) {
|
||
|
printk("nf_conntrack: can't register to sysctl.\n");
|
||
|
ret = -ENOMEM;
|
||
|
goto cleanup_localinops;
|
||
|
}
|
||
|
#endif
|
||
|
|
||
|
/* For use by REJECT target */
|
||
|
ip_ct_attach = __nf_conntrack_attach;
|
||
|
|
||
|
return ret;
|
||
|
|
||
|
cleanup:
|
||
|
synchronize_net();
|
||
|
ip_ct_attach = NULL;
|
||
|
#ifdef CONFIG_SYSCTL
|
||
|
unregister_sysctl_table(nf_ct_ipv4_sysctl_header);
|
||
|
cleanup_localinops:
|
||
|
#endif
|
||
|
nf_unregister_hook(&ipv4_conntrack_local_in_ops);
|
||
|
cleanup_inoutandlocalops:
|
||
|
nf_unregister_hook(&ipv4_conntrack_out_ops);
|
||
|
cleanup_helperoutops:
|
||
|
nf_unregister_hook(&ipv4_conntrack_helper_out_ops);
|
||
|
cleanup_helperinops:
|
||
|
nf_unregister_hook(&ipv4_conntrack_helper_in_ops);
|
||
|
cleanup_inandlocalops:
|
||
|
nf_unregister_hook(&ipv4_conntrack_local_out_ops);
|
||
|
cleanup_inops:
|
||
|
nf_unregister_hook(&ipv4_conntrack_in_ops);
|
||
|
cleanup_defraglocalops:
|
||
|
nf_unregister_hook(&ipv4_conntrack_defrag_local_out_ops);
|
||
|
cleanup_defragops:
|
||
|
nf_unregister_hook(&ipv4_conntrack_defrag_ops);
|
||
|
cleanup_ipv4:
|
||
|
nf_conntrack_l3proto_unregister(&nf_conntrack_l3proto_ipv4);
|
||
|
cleanup_icmp:
|
||
|
nf_conntrack_protocol_unregister(&nf_conntrack_protocol_icmp);
|
||
|
cleanup_udp:
|
||
|
nf_conntrack_protocol_unregister(&nf_conntrack_protocol_udp4);
|
||
|
cleanup_tcp:
|
||
|
nf_conntrack_protocol_unregister(&nf_conntrack_protocol_tcp4);
|
||
|
cleanup_sockopt:
|
||
|
nf_unregister_sockopt(&so_getorigdst);
|
||
|
cleanup_nothing:
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
MODULE_LICENSE("GPL");
|
||
|
|
||
|
static int __init init(void)
|
||
|
{
|
||
|
need_nf_conntrack();
|
||
|
return init_or_cleanup(1);
|
||
|
}
|
||
|
|
||
|
static void __exit fini(void)
|
||
|
{
|
||
|
init_or_cleanup(0);
|
||
|
}
|
||
|
|
||
|
module_init(init);
|
||
|
module_exit(fini);
|
||
|
|
||
|
void need_ip_conntrack(void)
|
||
|
{
|
||
|
}
|
||
|
|
||
|
EXPORT_SYMBOL(need_ip_conntrack);
|
||
|
EXPORT_SYMBOL(nf_ct_ipv4_gather_frags);
|