2012-08-26 11:14:06 -06:00
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/*
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* (C) 1999-2001 Paul `Rusty' Russell
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* (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
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* (C) 2011 Patrick McHardy <kaber@trash.net>
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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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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/ip.h>
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#include <linux/icmp.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter_ipv4.h>
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#include <net/secure_seq.h>
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#include <net/checksum.h>
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#include <net/route.h>
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#include <net/ip.h>
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#include <net/netfilter/nf_conntrack_core.h>
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#include <net/netfilter/nf_conntrack.h>
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#include <net/netfilter/nf_nat_core.h>
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#include <net/netfilter/nf_nat_l3proto.h>
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#include <net/netfilter/nf_nat_l4proto.h>
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static const struct nf_nat_l3proto nf_nat_l3proto_ipv4;
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#ifdef CONFIG_XFRM
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static void nf_nat_ipv4_decode_session(struct sk_buff *skb,
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const struct nf_conn *ct,
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enum ip_conntrack_dir dir,
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unsigned long statusbit,
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struct flowi *fl)
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{
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const struct nf_conntrack_tuple *t = &ct->tuplehash[dir].tuple;
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struct flowi4 *fl4 = &fl->u.ip4;
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if (ct->status & statusbit) {
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fl4->daddr = t->dst.u3.ip;
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if (t->dst.protonum == IPPROTO_TCP ||
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t->dst.protonum == IPPROTO_UDP ||
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t->dst.protonum == IPPROTO_UDPLITE ||
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t->dst.protonum == IPPROTO_DCCP ||
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t->dst.protonum == IPPROTO_SCTP)
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fl4->fl4_dport = t->dst.u.all;
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}
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statusbit ^= IPS_NAT_MASK;
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if (ct->status & statusbit) {
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fl4->saddr = t->src.u3.ip;
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if (t->dst.protonum == IPPROTO_TCP ||
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t->dst.protonum == IPPROTO_UDP ||
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t->dst.protonum == IPPROTO_UDPLITE ||
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t->dst.protonum == IPPROTO_DCCP ||
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t->dst.protonum == IPPROTO_SCTP)
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fl4->fl4_sport = t->src.u.all;
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}
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}
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#endif /* CONFIG_XFRM */
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static bool nf_nat_ipv4_in_range(const struct nf_conntrack_tuple *t,
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const struct nf_nat_range *range)
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{
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return ntohl(t->src.u3.ip) >= ntohl(range->min_addr.ip) &&
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ntohl(t->src.u3.ip) <= ntohl(range->max_addr.ip);
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}
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static u32 nf_nat_ipv4_secure_port(const struct nf_conntrack_tuple *t,
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__be16 dport)
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{
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return secure_ipv4_port_ephemeral(t->src.u3.ip, t->dst.u3.ip, dport);
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}
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static bool nf_nat_ipv4_manip_pkt(struct sk_buff *skb,
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unsigned int iphdroff,
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const struct nf_nat_l4proto *l4proto,
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const struct nf_conntrack_tuple *target,
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enum nf_nat_manip_type maniptype)
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{
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struct iphdr *iph;
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unsigned int hdroff;
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if (!skb_make_writable(skb, iphdroff + sizeof(*iph)))
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return false;
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iph = (void *)skb->data + iphdroff;
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hdroff = iphdroff + iph->ihl * 4;
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if (!l4proto->manip_pkt(skb, &nf_nat_l3proto_ipv4, iphdroff, hdroff,
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target, maniptype))
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return false;
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iph = (void *)skb->data + iphdroff;
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if (maniptype == NF_NAT_MANIP_SRC) {
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csum_replace4(&iph->check, iph->saddr, target->src.u3.ip);
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iph->saddr = target->src.u3.ip;
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} else {
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csum_replace4(&iph->check, iph->daddr, target->dst.u3.ip);
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iph->daddr = target->dst.u3.ip;
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}
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return true;
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}
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static void nf_nat_ipv4_csum_update(struct sk_buff *skb,
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unsigned int iphdroff, __sum16 *check,
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const struct nf_conntrack_tuple *t,
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enum nf_nat_manip_type maniptype)
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{
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struct iphdr *iph = (struct iphdr *)(skb->data + iphdroff);
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__be32 oldip, newip;
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if (maniptype == NF_NAT_MANIP_SRC) {
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oldip = iph->saddr;
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newip = t->src.u3.ip;
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} else {
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oldip = iph->daddr;
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newip = t->dst.u3.ip;
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}
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inet_proto_csum_replace4(check, skb, oldip, newip, 1);
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}
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static void nf_nat_ipv4_csum_recalc(struct sk_buff *skb,
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u8 proto, void *data, __sum16 *check,
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int datalen, int oldlen)
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{
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const struct iphdr *iph = ip_hdr(skb);
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struct rtable *rt = skb_rtable(skb);
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if (skb->ip_summed != CHECKSUM_PARTIAL) {
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if (!(rt->rt_flags & RTCF_LOCAL) &&
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(!skb->dev || skb->dev->features & NETIF_F_V4_CSUM)) {
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skb->ip_summed = CHECKSUM_PARTIAL;
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skb->csum_start = skb_headroom(skb) +
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skb_network_offset(skb) +
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ip_hdrlen(skb);
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skb->csum_offset = (void *)check - data;
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*check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
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datalen, proto, 0);
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} else {
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*check = 0;
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*check = csum_tcpudp_magic(iph->saddr, iph->daddr,
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datalen, proto,
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csum_partial(data, datalen,
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0));
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if (proto == IPPROTO_UDP && !*check)
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*check = CSUM_MANGLED_0;
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}
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} else
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inet_proto_csum_replace2(check, skb,
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htons(oldlen), htons(datalen), 1);
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}
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2014-06-29 19:19:32 -06:00
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#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
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2012-08-26 11:14:06 -06:00
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static int nf_nat_ipv4_nlattr_to_range(struct nlattr *tb[],
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struct nf_nat_range *range)
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{
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if (tb[CTA_NAT_V4_MINIP]) {
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range->min_addr.ip = nla_get_be32(tb[CTA_NAT_V4_MINIP]);
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range->flags |= NF_NAT_RANGE_MAP_IPS;
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}
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if (tb[CTA_NAT_V4_MAXIP])
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range->max_addr.ip = nla_get_be32(tb[CTA_NAT_V4_MAXIP]);
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else
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range->max_addr.ip = range->min_addr.ip;
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return 0;
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}
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2014-06-29 19:19:32 -06:00
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#endif
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2012-08-26 11:14:06 -06:00
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static const struct nf_nat_l3proto nf_nat_l3proto_ipv4 = {
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.l3proto = NFPROTO_IPV4,
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.in_range = nf_nat_ipv4_in_range,
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.secure_port = nf_nat_ipv4_secure_port,
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.manip_pkt = nf_nat_ipv4_manip_pkt,
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.csum_update = nf_nat_ipv4_csum_update,
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.csum_recalc = nf_nat_ipv4_csum_recalc,
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2014-06-29 19:19:32 -06:00
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#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
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2012-08-26 11:14:06 -06:00
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.nlattr_to_range = nf_nat_ipv4_nlattr_to_range,
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2014-06-29 19:19:32 -06:00
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#endif
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2012-08-26 11:14:06 -06:00
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#ifdef CONFIG_XFRM
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.decode_session = nf_nat_ipv4_decode_session,
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#endif
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};
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int nf_nat_icmp_reply_translation(struct sk_buff *skb,
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struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned int hooknum)
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{
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struct {
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struct icmphdr icmp;
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struct iphdr ip;
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} *inside;
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enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
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enum nf_nat_manip_type manip = HOOK2MANIP(hooknum);
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unsigned int hdrlen = ip_hdrlen(skb);
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const struct nf_nat_l4proto *l4proto;
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struct nf_conntrack_tuple target;
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unsigned long statusbit;
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NF_CT_ASSERT(ctinfo == IP_CT_RELATED || ctinfo == IP_CT_RELATED_REPLY);
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if (!skb_make_writable(skb, hdrlen + sizeof(*inside)))
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return 0;
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if (nf_ip_checksum(skb, hooknum, hdrlen, 0))
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return 0;
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inside = (void *)skb->data + hdrlen;
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if (inside->icmp.type == ICMP_REDIRECT) {
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if ((ct->status & IPS_NAT_DONE_MASK) != IPS_NAT_DONE_MASK)
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return 0;
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if (ct->status & IPS_NAT_MASK)
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return 0;
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}
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if (manip == NF_NAT_MANIP_SRC)
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statusbit = IPS_SRC_NAT;
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else
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statusbit = IPS_DST_NAT;
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/* Invert if this is reply direction */
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if (dir == IP_CT_DIR_REPLY)
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statusbit ^= IPS_NAT_MASK;
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if (!(ct->status & statusbit))
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return 1;
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l4proto = __nf_nat_l4proto_find(NFPROTO_IPV4, inside->ip.protocol);
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if (!nf_nat_ipv4_manip_pkt(skb, hdrlen + sizeof(inside->icmp),
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l4proto, &ct->tuplehash[!dir].tuple, !manip))
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return 0;
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if (skb->ip_summed != CHECKSUM_PARTIAL) {
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/* Reloading "inside" here since manip_pkt may reallocate */
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inside = (void *)skb->data + hdrlen;
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inside->icmp.checksum = 0;
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inside->icmp.checksum =
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csum_fold(skb_checksum(skb, hdrlen,
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skb->len - hdrlen, 0));
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}
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/* Change outer to look like the reply to an incoming packet */
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nf_ct_invert_tuplepr(&target, &ct->tuplehash[!dir].tuple);
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l4proto = __nf_nat_l4proto_find(NFPROTO_IPV4, 0);
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if (!nf_nat_ipv4_manip_pkt(skb, 0, l4proto, &target, manip))
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return 0;
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return 1;
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}
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EXPORT_SYMBOL_GPL(nf_nat_icmp_reply_translation);
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2014-08-05 12:02:42 -06:00
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unsigned int
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nf_nat_ipv4_fn(const struct nf_hook_ops *ops, struct sk_buff *skb,
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const struct net_device *in, const struct net_device *out,
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unsigned int (*do_chain)(const struct nf_hook_ops *ops,
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struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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struct nf_conn *ct))
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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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struct nf_conn_nat *nat;
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/* maniptype == SRC for postrouting. */
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enum nf_nat_manip_type maniptype = HOOK2MANIP(ops->hooknum);
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/* We never see fragments: conntrack defrags on pre-routing
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* and local-out, and nf_nat_out protects post-routing.
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*/
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NF_CT_ASSERT(!ip_is_fragment(ip_hdr(skb)));
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ct = nf_ct_get(skb, &ctinfo);
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/* Can't track? It's not due to stress, or conntrack would
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* have dropped it. Hence it's the user's responsibilty to
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* packet filter it out, or implement conntrack/NAT for that
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* protocol. 8) --RR
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*/
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if (!ct)
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return NF_ACCEPT;
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/* Don't try to NAT if this packet is not conntracked */
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if (nf_ct_is_untracked(ct))
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return NF_ACCEPT;
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nat = nf_ct_nat_ext_add(ct);
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if (nat == NULL)
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return NF_ACCEPT;
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switch (ctinfo) {
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case IP_CT_RELATED:
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case IP_CT_RELATED_REPLY:
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if (ip_hdr(skb)->protocol == IPPROTO_ICMP) {
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if (!nf_nat_icmp_reply_translation(skb, ct, ctinfo,
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ops->hooknum))
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return NF_DROP;
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else
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return NF_ACCEPT;
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}
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/* Fall thru... (Only ICMPs can be IP_CT_IS_REPLY) */
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case IP_CT_NEW:
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/* Seen it before? This can happen for loopback, retrans,
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* or local packets.
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*/
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if (!nf_nat_initialized(ct, maniptype)) {
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unsigned int ret;
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ret = do_chain(ops, skb, in, out, ct);
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if (ret != NF_ACCEPT)
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return ret;
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if (nf_nat_initialized(ct, HOOK2MANIP(ops->hooknum)))
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break;
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ret = nf_nat_alloc_null_binding(ct, ops->hooknum);
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if (ret != NF_ACCEPT)
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return ret;
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} else {
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pr_debug("Already setup manip %s for ct %p\n",
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maniptype == NF_NAT_MANIP_SRC ? "SRC" : "DST",
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ct);
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if (nf_nat_oif_changed(ops->hooknum, ctinfo, nat, out))
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goto oif_changed;
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}
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break;
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default:
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/* ESTABLISHED */
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NF_CT_ASSERT(ctinfo == IP_CT_ESTABLISHED ||
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ctinfo == IP_CT_ESTABLISHED_REPLY);
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if (nf_nat_oif_changed(ops->hooknum, ctinfo, nat, out))
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goto oif_changed;
|
|
|
|
}
|
|
|
|
|
|
|
|
return nf_nat_packet(ct, ctinfo, ops->hooknum, skb);
|
|
|
|
|
|
|
|
oif_changed:
|
|
|
|
nf_ct_kill_acct(ct, ctinfo, skb);
|
|
|
|
return NF_DROP;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(nf_nat_ipv4_fn);
|
|
|
|
|
|
|
|
unsigned int
|
|
|
|
nf_nat_ipv4_in(const struct nf_hook_ops *ops, struct sk_buff *skb,
|
|
|
|
const struct net_device *in, const struct net_device *out,
|
|
|
|
unsigned int (*do_chain)(const struct nf_hook_ops *ops,
|
|
|
|
struct sk_buff *skb,
|
|
|
|
const struct net_device *in,
|
|
|
|
const struct net_device *out,
|
|
|
|
struct nf_conn *ct))
|
|
|
|
{
|
|
|
|
unsigned int ret;
|
|
|
|
__be32 daddr = ip_hdr(skb)->daddr;
|
|
|
|
|
|
|
|
ret = nf_nat_ipv4_fn(ops, skb, in, out, do_chain);
|
|
|
|
if (ret != NF_DROP && ret != NF_STOLEN &&
|
|
|
|
daddr != ip_hdr(skb)->daddr)
|
|
|
|
skb_dst_drop(skb);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(nf_nat_ipv4_in);
|
|
|
|
|
|
|
|
unsigned int
|
|
|
|
nf_nat_ipv4_out(const struct nf_hook_ops *ops, struct sk_buff *skb,
|
|
|
|
const struct net_device *in, const struct net_device *out,
|
|
|
|
unsigned int (*do_chain)(const struct nf_hook_ops *ops,
|
|
|
|
struct sk_buff *skb,
|
|
|
|
const struct net_device *in,
|
|
|
|
const struct net_device *out,
|
|
|
|
struct nf_conn *ct))
|
|
|
|
{
|
|
|
|
#ifdef CONFIG_XFRM
|
|
|
|
const struct nf_conn *ct;
|
|
|
|
enum ip_conntrack_info ctinfo;
|
|
|
|
int err;
|
|
|
|
#endif
|
|
|
|
unsigned int ret;
|
|
|
|
|
|
|
|
/* root is playing with raw sockets. */
|
|
|
|
if (skb->len < sizeof(struct iphdr) ||
|
|
|
|
ip_hdrlen(skb) < sizeof(struct iphdr))
|
|
|
|
return NF_ACCEPT;
|
|
|
|
|
|
|
|
ret = nf_nat_ipv4_fn(ops, skb, in, out, do_chain);
|
|
|
|
#ifdef CONFIG_XFRM
|
|
|
|
if (ret != NF_DROP && ret != NF_STOLEN &&
|
|
|
|
!(IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED) &&
|
|
|
|
(ct = nf_ct_get(skb, &ctinfo)) != NULL) {
|
|
|
|
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
|
|
|
|
|
|
|
|
if ((ct->tuplehash[dir].tuple.src.u3.ip !=
|
|
|
|
ct->tuplehash[!dir].tuple.dst.u3.ip) ||
|
|
|
|
(ct->tuplehash[dir].tuple.dst.protonum != IPPROTO_ICMP &&
|
|
|
|
ct->tuplehash[dir].tuple.src.u.all !=
|
|
|
|
ct->tuplehash[!dir].tuple.dst.u.all)) {
|
|
|
|
err = nf_xfrm_me_harder(skb, AF_INET);
|
|
|
|
if (err < 0)
|
|
|
|
ret = NF_DROP_ERR(err);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(nf_nat_ipv4_out);
|
|
|
|
|
|
|
|
unsigned int
|
|
|
|
nf_nat_ipv4_local_fn(const struct nf_hook_ops *ops, struct sk_buff *skb,
|
|
|
|
const struct net_device *in, const struct net_device *out,
|
|
|
|
unsigned int (*do_chain)(const struct nf_hook_ops *ops,
|
|
|
|
struct sk_buff *skb,
|
|
|
|
const struct net_device *in,
|
|
|
|
const struct net_device *out,
|
|
|
|
struct nf_conn *ct))
|
|
|
|
{
|
|
|
|
const struct nf_conn *ct;
|
|
|
|
enum ip_conntrack_info ctinfo;
|
|
|
|
unsigned int ret;
|
|
|
|
int err;
|
|
|
|
|
|
|
|
/* root is playing with raw sockets. */
|
|
|
|
if (skb->len < sizeof(struct iphdr) ||
|
|
|
|
ip_hdrlen(skb) < sizeof(struct iphdr))
|
|
|
|
return NF_ACCEPT;
|
|
|
|
|
|
|
|
ret = nf_nat_ipv4_fn(ops, skb, in, out, do_chain);
|
|
|
|
if (ret != NF_DROP && ret != NF_STOLEN &&
|
|
|
|
(ct = nf_ct_get(skb, &ctinfo)) != NULL) {
|
|
|
|
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
|
|
|
|
|
|
|
|
if (ct->tuplehash[dir].tuple.dst.u3.ip !=
|
|
|
|
ct->tuplehash[!dir].tuple.src.u3.ip) {
|
|
|
|
err = ip_route_me_harder(skb, RTN_UNSPEC);
|
|
|
|
if (err < 0)
|
|
|
|
ret = NF_DROP_ERR(err);
|
|
|
|
}
|
|
|
|
#ifdef CONFIG_XFRM
|
|
|
|
else if (!(IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED) &&
|
|
|
|
ct->tuplehash[dir].tuple.dst.protonum != IPPROTO_ICMP &&
|
|
|
|
ct->tuplehash[dir].tuple.dst.u.all !=
|
|
|
|
ct->tuplehash[!dir].tuple.src.u.all) {
|
|
|
|
err = nf_xfrm_me_harder(skb, AF_INET);
|
|
|
|
if (err < 0)
|
|
|
|
ret = NF_DROP_ERR(err);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(nf_nat_ipv4_local_fn);
|
|
|
|
|
2012-08-26 11:14:06 -06:00
|
|
|
static int __init nf_nat_l3proto_ipv4_init(void)
|
|
|
|
{
|
|
|
|
int err;
|
|
|
|
|
|
|
|
err = nf_nat_l4proto_register(NFPROTO_IPV4, &nf_nat_l4proto_icmp);
|
|
|
|
if (err < 0)
|
|
|
|
goto err1;
|
|
|
|
err = nf_nat_l3proto_register(&nf_nat_l3proto_ipv4);
|
|
|
|
if (err < 0)
|
|
|
|
goto err2;
|
|
|
|
return err;
|
|
|
|
|
|
|
|
err2:
|
|
|
|
nf_nat_l4proto_unregister(NFPROTO_IPV4, &nf_nat_l4proto_icmp);
|
|
|
|
err1:
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit nf_nat_l3proto_ipv4_exit(void)
|
|
|
|
{
|
|
|
|
nf_nat_l3proto_unregister(&nf_nat_l3proto_ipv4);
|
|
|
|
nf_nat_l4proto_unregister(NFPROTO_IPV4, &nf_nat_l4proto_icmp);
|
|
|
|
}
|
|
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
MODULE_ALIAS("nf-nat-" __stringify(AF_INET));
|
|
|
|
|
|
|
|
module_init(nf_nat_l3proto_ipv4_init);
|
|
|
|
module_exit(nf_nat_l3proto_ipv4_exit);
|