diff options
author | Patrick McHardy <kaber@trash.net> | 2012-08-26 19:14:06 +0200 |
---|---|---|
committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2012-08-30 03:00:14 +0200 |
commit | c7232c9979cba684c50b64c513c4a83c9aa70563 (patch) | |
tree | dbe0fdac62191d85935f5a3dfe815c1b1add60f9 /net/ipv4/netfilter | |
parent | 051966c0c644a1c96092d4206e00704ade813c9a (diff) |
netfilter: add protocol independent NAT core
Convert the IPv4 NAT implementation to a protocol independent core and
address family specific modules.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Diffstat (limited to 'net/ipv4/netfilter')
27 files changed, 518 insertions, 2345 deletions
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig index fcc543cd987a..b26629681bdb 100644 --- a/net/ipv4/netfilter/Kconfig +++ b/net/ipv4/netfilter/Kconfig @@ -143,25 +143,22 @@ config IP_NF_TARGET_ULOG To compile it as a module, choose M here. If unsure, say N. # NAT + specific targets: nf_conntrack -config NF_NAT - tristate "Full NAT" +config NF_NAT_IPV4 + tristate "IPv4 NAT" depends on NF_CONNTRACK_IPV4 default m if NETFILTER_ADVANCED=n + select NF_NAT help - The Full NAT option allows masquerading, port forwarding and other + The IPv4 NAT option allows masquerading, port forwarding and other forms of full Network Address Port Translation. It is controlled by the `nat' table in iptables: see the man page for iptables(8). To compile it as a module, choose M here. If unsure, say N. -config NF_NAT_NEEDED - bool - depends on NF_NAT - default y +if NF_NAT_IPV4 config IP_NF_TARGET_MASQUERADE tristate "MASQUERADE target support" - depends on NF_NAT default m if NETFILTER_ADVANCED=n help Masquerading is a special case of NAT: all outgoing connections are @@ -174,7 +171,6 @@ config IP_NF_TARGET_MASQUERADE config IP_NF_TARGET_NETMAP tristate "NETMAP target support" - depends on NF_NAT depends on NETFILTER_ADVANCED help NETMAP is an implementation of static 1:1 NAT mapping of network @@ -185,7 +181,6 @@ config IP_NF_TARGET_NETMAP config IP_NF_TARGET_REDIRECT tristate "REDIRECT target support" - depends on NF_NAT depends on NETFILTER_ADVANCED help REDIRECT is a special case of NAT: all incoming connections are @@ -195,9 +190,11 @@ config IP_NF_TARGET_REDIRECT To compile it as a module, choose M here. If unsure, say N. +endif + config NF_NAT_SNMP_BASIC tristate "Basic SNMP-ALG support" - depends on NF_CONNTRACK_SNMP && NF_NAT + depends on NF_CONNTRACK_SNMP && NF_NAT_IPV4 depends on NETFILTER_ADVANCED default NF_NAT && NF_CONNTRACK_SNMP ---help--- @@ -219,61 +216,46 @@ config NF_NAT_SNMP_BASIC # <expr> '&&' <expr> (6) # # (6) Returns the result of min(/expr/, /expr/). -config NF_NAT_PROTO_DCCP - tristate - depends on NF_NAT && NF_CT_PROTO_DCCP - default NF_NAT && NF_CT_PROTO_DCCP config NF_NAT_PROTO_GRE tristate - depends on NF_NAT && NF_CT_PROTO_GRE - -config NF_NAT_PROTO_UDPLITE - tristate - depends on NF_NAT && NF_CT_PROTO_UDPLITE - default NF_NAT && NF_CT_PROTO_UDPLITE - -config NF_NAT_PROTO_SCTP - tristate - default NF_NAT && NF_CT_PROTO_SCTP - depends on NF_NAT && NF_CT_PROTO_SCTP - select LIBCRC32C + depends on NF_NAT_IPV4 && NF_CT_PROTO_GRE config NF_NAT_FTP tristate - depends on NF_CONNTRACK && NF_NAT - default NF_NAT && NF_CONNTRACK_FTP + depends on NF_CONNTRACK && NF_NAT_IPV4 + default NF_NAT_IPV4 && NF_CONNTRACK_FTP config NF_NAT_IRC tristate - depends on NF_CONNTRACK && NF_NAT - default NF_NAT && NF_CONNTRACK_IRC + depends on NF_CONNTRACK && NF_NAT_IPV4 + default NF_NAT_IPV4 && NF_CONNTRACK_IRC config NF_NAT_TFTP tristate - depends on NF_CONNTRACK && NF_NAT - default NF_NAT && NF_CONNTRACK_TFTP + depends on NF_CONNTRACK && NF_NAT_IPV4 + default NF_NAT_IPV4 && NF_CONNTRACK_TFTP config NF_NAT_AMANDA tristate - depends on NF_CONNTRACK && NF_NAT - default NF_NAT && NF_CONNTRACK_AMANDA + depends on NF_CONNTRACK && NF_NAT_IPV4 + default NF_NAT_IPV4 && NF_CONNTRACK_AMANDA config NF_NAT_PPTP tristate - depends on NF_CONNTRACK && NF_NAT - default NF_NAT && NF_CONNTRACK_PPTP + depends on NF_CONNTRACK && NF_NAT_IPV4 + default NF_NAT_IPV4 && NF_CONNTRACK_PPTP select NF_NAT_PROTO_GRE config NF_NAT_H323 tristate - depends on NF_CONNTRACK && NF_NAT - default NF_NAT && NF_CONNTRACK_H323 + depends on NF_CONNTRACK && NF_NAT_IPV4 + default NF_NAT_IPV4 && NF_CONNTRACK_H323 config NF_NAT_SIP tristate - depends on NF_CONNTRACK && NF_NAT - default NF_NAT && NF_CONNTRACK_SIP + depends on NF_CONNTRACK && NF_NAT_IPV4 + default NF_NAT_IPV4 && NF_CONNTRACK_SIP # mangle + specific targets config IP_NF_MANGLE diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile index c20674dc9452..0ea3acc510e2 100644 --- a/net/ipv4/netfilter/Makefile +++ b/net/ipv4/netfilter/Makefile @@ -10,13 +10,11 @@ nf_conntrack_ipv4-objs += nf_conntrack_l3proto_ipv4_compat.o endif endif -nf_nat-y := nf_nat_core.o nf_nat_helper.o nf_nat_proto_unknown.o nf_nat_proto_common.o nf_nat_proto_tcp.o nf_nat_proto_udp.o nf_nat_proto_icmp.o -iptable_nat-y := nf_nat_rule.o nf_nat_standalone.o - # connection tracking obj-$(CONFIG_NF_CONNTRACK_IPV4) += nf_conntrack_ipv4.o -obj-$(CONFIG_NF_NAT) += nf_nat.o +nf_nat_ipv4-y := nf_nat_l3proto_ipv4.o nf_nat_proto_icmp.o +obj-$(CONFIG_NF_NAT_IPV4) += nf_nat_ipv4.o # defrag obj-$(CONFIG_NF_DEFRAG_IPV4) += nf_defrag_ipv4.o @@ -32,10 +30,7 @@ obj-$(CONFIG_NF_NAT_SNMP_BASIC) += nf_nat_snmp_basic.o obj-$(CONFIG_NF_NAT_TFTP) += nf_nat_tftp.o # NAT protocols (nf_nat) -obj-$(CONFIG_NF_NAT_PROTO_DCCP) += nf_nat_proto_dccp.o obj-$(CONFIG_NF_NAT_PROTO_GRE) += nf_nat_proto_gre.o -obj-$(CONFIG_NF_NAT_PROTO_UDPLITE) += nf_nat_proto_udplite.o -obj-$(CONFIG_NF_NAT_PROTO_SCTP) += nf_nat_proto_sctp.o # generic IP tables obj-$(CONFIG_IP_NF_IPTABLES) += ip_tables.o @@ -43,7 +38,7 @@ obj-$(CONFIG_IP_NF_IPTABLES) += ip_tables.o # the three instances of ip_tables obj-$(CONFIG_IP_NF_FILTER) += iptable_filter.o obj-$(CONFIG_IP_NF_MANGLE) += iptable_mangle.o -obj-$(CONFIG_NF_NAT) += iptable_nat.o +obj-$(CONFIG_NF_NAT_IPV4) += iptable_nat.o obj-$(CONFIG_IP_NF_RAW) += iptable_raw.o obj-$(CONFIG_IP_NF_SECURITY) += iptable_security.o diff --git a/net/ipv4/netfilter/ipt_MASQUERADE.c b/net/ipv4/netfilter/ipt_MASQUERADE.c index cbb6a1a6f6f7..1c3aa28b51ae 100644 --- a/net/ipv4/netfilter/ipt_MASQUERADE.c +++ b/net/ipv4/netfilter/ipt_MASQUERADE.c @@ -19,9 +19,9 @@ #include <net/ip.h> #include <net/checksum.h> #include <net/route.h> -#include <net/netfilter/nf_nat_rule.h> #include <linux/netfilter_ipv4.h> #include <linux/netfilter/x_tables.h> +#include <net/netfilter/nf_nat.h> MODULE_LICENSE("GPL"); MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); @@ -49,7 +49,7 @@ masquerade_tg(struct sk_buff *skb, const struct xt_action_param *par) struct nf_conn *ct; struct nf_conn_nat *nat; enum ip_conntrack_info ctinfo; - struct nf_nat_ipv4_range newrange; + struct nf_nat_range newrange; const struct nf_nat_ipv4_multi_range_compat *mr; const struct rtable *rt; __be32 newsrc, nh; @@ -80,10 +80,13 @@ masquerade_tg(struct sk_buff *skb, const struct xt_action_param *par) nat->masq_index = par->out->ifindex; /* Transfer from original range. */ - newrange = ((struct nf_nat_ipv4_range) - { mr->range[0].flags | NF_NAT_RANGE_MAP_IPS, - newsrc, newsrc, - mr->range[0].min, mr->range[0].max }); + memset(&newrange.min_addr, 0, sizeof(newrange.min_addr)); + memset(&newrange.max_addr, 0, sizeof(newrange.max_addr)); + newrange.flags = mr->range[0].flags | NF_NAT_RANGE_MAP_IPS; + newrange.min_addr.ip = newsrc; + newrange.max_addr.ip = newsrc; + newrange.min_proto = mr->range[0].min; + newrange.max_proto = mr->range[0].max; /* Hand modified range to generic setup. */ return nf_nat_setup_info(ct, &newrange, NF_NAT_MANIP_SRC); diff --git a/net/ipv4/netfilter/ipt_NETMAP.c b/net/ipv4/netfilter/ipt_NETMAP.c index b5bfbbabf70d..85028dc0425d 100644 --- a/net/ipv4/netfilter/ipt_NETMAP.c +++ b/net/ipv4/netfilter/ipt_NETMAP.c @@ -16,7 +16,7 @@ #include <linux/netfilter.h> #include <linux/netfilter_ipv4.h> #include <linux/netfilter/x_tables.h> -#include <net/netfilter/nf_nat_rule.h> +#include <net/netfilter/nf_nat.h> MODULE_LICENSE("GPL"); MODULE_AUTHOR("Svenning Soerensen <svenning@post5.tele.dk>"); @@ -44,7 +44,7 @@ netmap_tg(struct sk_buff *skb, const struct xt_action_param *par) enum ip_conntrack_info ctinfo; __be32 new_ip, netmask; const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo; - struct nf_nat_ipv4_range newrange; + struct nf_nat_range newrange; NF_CT_ASSERT(par->hooknum == NF_INET_PRE_ROUTING || par->hooknum == NF_INET_POST_ROUTING || @@ -61,10 +61,13 @@ netmap_tg(struct sk_buff *skb, const struct xt_action_param *par) new_ip = ip_hdr(skb)->saddr & ~netmask; new_ip |= mr->range[0].min_ip & netmask; - newrange = ((struct nf_nat_ipv4_range) - { mr->range[0].flags | NF_NAT_RANGE_MAP_IPS, - new_ip, new_ip, - mr->range[0].min, mr->range[0].max }); + memset(&newrange.min_addr, 0, sizeof(newrange.min_addr)); + memset(&newrange.max_addr, 0, sizeof(newrange.max_addr)); + newrange.flags = mr->range[0].flags | NF_NAT_RANGE_MAP_IPS; + newrange.min_addr.ip = new_ip; + newrange.max_addr.ip = new_ip; + newrange.min_proto = mr->range[0].min; + newrange.max_proto = mr->range[0].max; /* Hand modified range to generic setup. */ return nf_nat_setup_info(ct, &newrange, HOOK2MANIP(par->hooknum)); diff --git a/net/ipv4/netfilter/ipt_REDIRECT.c b/net/ipv4/netfilter/ipt_REDIRECT.c index 7c0103a5203e..11407d7d2472 100644 --- a/net/ipv4/netfilter/ipt_REDIRECT.c +++ b/net/ipv4/netfilter/ipt_REDIRECT.c @@ -19,7 +19,7 @@ #include <net/checksum.h> #include <linux/netfilter_ipv4.h> #include <linux/netfilter/x_tables.h> -#include <net/netfilter/nf_nat_rule.h> +#include <net/netfilter/nf_nat.h> MODULE_LICENSE("GPL"); MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); @@ -48,7 +48,7 @@ redirect_tg(struct sk_buff *skb, const struct xt_action_param *par) enum ip_conntrack_info ctinfo; __be32 newdst; const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo; - struct nf_nat_ipv4_range newrange; + struct nf_nat_range newrange; NF_CT_ASSERT(par->hooknum == NF_INET_PRE_ROUTING || par->hooknum == NF_INET_LOCAL_OUT); @@ -76,10 +76,13 @@ redirect_tg(struct sk_buff *skb, const struct xt_action_param *par) } /* Transfer from original range. */ - newrange = ((struct nf_nat_ipv4_range) - { mr->range[0].flags | NF_NAT_RANGE_MAP_IPS, - newdst, newdst, - mr->range[0].min, mr->range[0].max }); + memset(&newrange.min_addr, 0, sizeof(newrange.min_addr)); + memset(&newrange.max_addr, 0, sizeof(newrange.max_addr)); + newrange.flags = mr->range[0].flags | NF_NAT_RANGE_MAP_IPS; + newrange.min_addr.ip = newdst; + newrange.max_addr.ip = newdst; + newrange.min_proto = mr->range[0].min; + newrange.max_proto = mr->range[0].max; /* Hand modified range to generic setup. */ return nf_nat_setup_info(ct, &newrange, NF_NAT_MANIP_DST); diff --git a/net/ipv4/netfilter/nf_nat_standalone.c b/net/ipv4/netfilter/iptable_nat.c index 3828a4229822..9e0ffaf1d942 100644 --- a/net/ipv4/netfilter/nf_nat_standalone.c +++ b/net/ipv4/netfilter/iptable_nat.c @@ -1,84 +1,71 @@ /* (C) 1999-2001 Paul `Rusty' Russell * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org> + * (C) 2011 Patrick McHardy <kaber@trash.net> * * 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. */ -#include <linux/types.h> -#include <linux/icmp.h> -#include <linux/gfp.h> -#include <linux/ip.h> + +#include <linux/module.h> #include <linux/netfilter.h> #include <linux/netfilter_ipv4.h> -#include <linux/module.h> -#include <linux/skbuff.h> -#include <linux/proc_fs.h> +#include <linux/netfilter_ipv4/ip_tables.h> +#include <linux/ip.h> #include <net/ip.h> -#include <net/checksum.h> -#include <linux/spinlock.h> -#include <net/netfilter/nf_conntrack.h> -#include <net/netfilter/nf_conntrack_core.h> -#include <net/netfilter/nf_conntrack_extend.h> #include <net/netfilter/nf_nat.h> -#include <net/netfilter/nf_nat_rule.h> -#include <net/netfilter/nf_nat_protocol.h> #include <net/netfilter/nf_nat_core.h> -#include <net/netfilter/nf_nat_helper.h> -#include <linux/netfilter_ipv4/ip_tables.h> +#include <net/netfilter/nf_nat_l3proto.h> + +static const struct xt_table nf_nat_ipv4_table = { + .name = "nat", + .valid_hooks = (1 << NF_INET_PRE_ROUTING) | + (1 << NF_INET_POST_ROUTING) | + (1 << NF_INET_LOCAL_OUT) | + (1 << NF_INET_LOCAL_IN), + .me = THIS_MODULE, + .af = NFPROTO_IPV4, +}; -#ifdef CONFIG_XFRM -static void nat_decode_session(struct sk_buff *skb, struct flowi *fl) +static unsigned int alloc_null_binding(struct nf_conn *ct, unsigned int hooknum) { - struct flowi4 *fl4 = &fl->u.ip4; - const struct nf_conn *ct; - const struct nf_conntrack_tuple *t; - enum ip_conntrack_info ctinfo; - enum ip_conntrack_dir dir; - unsigned long statusbit; - - ct = nf_ct_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) { - fl4->daddr = t->dst.u3.ip; - if (t->dst.protonum == IPPROTO_TCP || - t->dst.protonum == IPPROTO_UDP || - t->dst.protonum == IPPROTO_UDPLITE || - t->dst.protonum == IPPROTO_DCCP || - t->dst.protonum == IPPROTO_SCTP) - fl4->fl4_dport = t->dst.u.tcp.port; - } + /* Force range to this IP; let proto decide mapping for + * per-proto parts (hence not IP_NAT_RANGE_PROTO_SPECIFIED). + */ + struct nf_nat_range range; + + range.flags = 0; + pr_debug("Allocating NULL binding for %p (%pI4)\n", ct, + HOOK2MANIP(hooknum) == NF_NAT_MANIP_SRC ? + &ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u3.ip : + &ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.u3.ip); + + return nf_nat_setup_info(ct, &range, HOOK2MANIP(hooknum)); +} - statusbit ^= IPS_NAT_MASK; +static unsigned int nf_nat_rule_find(struct sk_buff *skb, unsigned int hooknum, + const struct net_device *in, + const struct net_device *out, + struct nf_conn *ct) +{ + struct net *net = nf_ct_net(ct); + unsigned int ret; - if (ct->status & statusbit) { - fl4->saddr = t->src.u3.ip; - if (t->dst.protonum == IPPROTO_TCP || - t->dst.protonum == IPPROTO_UDP || - t->dst.protonum == IPPROTO_UDPLITE || - t->dst.protonum == IPPROTO_DCCP || - t->dst.protonum == IPPROTO_SCTP) - fl4->fl4_sport = t->src.u.tcp.port; + ret = ipt_do_table(skb, hooknum, in, out, net->ipv4.nat_table); + if (ret == NF_ACCEPT) { + if (!nf_nat_initialized(ct, HOOK2MANIP(hooknum))) + ret = alloc_null_binding(ct, hooknum); } + return ret; } -#endif static unsigned int -nf_nat_fn(unsigned int hooknum, - struct sk_buff *skb, - const struct net_device *in, - const struct net_device *out, - int (*okfn)(struct sk_buff *)) +nf_nat_ipv4_fn(unsigned int hooknum, + struct sk_buff *skb, + const struct net_device *in, + const struct net_device *out, + int (*okfn)(struct sk_buff *)) { struct nf_conn *ct; enum ip_conntrack_info ctinfo; @@ -87,14 +74,16 @@ nf_nat_fn(unsigned int hooknum, enum nf_nat_manip_type maniptype = HOOK2MANIP(hooknum); /* We never see fragments: conntrack defrags on pre-routing - and local-out, and nf_nat_out protects post-routing. */ + * and local-out, and nf_nat_out protects post-routing. + */ NF_CT_ASSERT(!ip_is_fragment(ip_hdr(skb))); ct = nf_ct_get(skb, &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 */ + * 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) return NF_ACCEPT; @@ -118,17 +107,17 @@ nf_nat_fn(unsigned int hooknum, case IP_CT_RELATED: case IP_CT_RELATED_REPLY: if (ip_hdr(skb)->protocol == IPPROTO_ICMP) { - if (!nf_nat_icmp_reply_translation(ct, ctinfo, - hooknum, skb)) + if (!nf_nat_icmp_reply_translation(skb, ct, ctinfo, + hooknum)) return NF_DROP; else return NF_ACCEPT; } /* Fall thru... (Only ICMPs can be IP_CT_IS_REPLY) */ case IP_CT_NEW: - /* Seen it before? This can happen for loopback, retrans, - or local packets.. */ + * or local packets. + */ if (!nf_nat_initialized(ct, maniptype)) { unsigned int ret; @@ -151,16 +140,16 @@ nf_nat_fn(unsigned int hooknum, } static unsigned int -nf_nat_in(unsigned int hooknum, - struct sk_buff *skb, - const struct net_device *in, - const struct net_device *out, - int (*okfn)(struct sk_buff *)) +nf_nat_ipv4_in(unsigned int hooknum, + struct sk_buff *skb, + const struct net_device *in, + const struct net_device *out, + int (*okfn)(struct sk_buff *)) { unsigned int ret; __be32 daddr = ip_hdr(skb)->daddr; - ret = nf_nat_fn(hooknum, skb, in, out, okfn); + ret = nf_nat_ipv4_fn(hooknum, skb, in, out, okfn); if (ret != NF_DROP && ret != NF_STOLEN && daddr != ip_hdr(skb)->daddr) skb_dst_drop(skb); @@ -169,11 +158,11 @@ nf_nat_in(unsigned int hooknum, } static unsigned int -nf_nat_out(unsigned int hooknum, - struct sk_buff *skb, - const struct net_device *in, - const struct net_device *out, - int (*okfn)(struct sk_buff *)) +nf_nat_ipv4_out(unsigned int hooknum, + struct sk_buff *skb, + const struct net_device *in, + const struct net_device *out, + int (*okfn)(struct sk_buff *)) { #ifdef CONFIG_XFRM const struct nf_conn *ct; @@ -186,29 +175,30 @@ nf_nat_out(unsigned int hooknum, ip_hdrlen(skb) < sizeof(struct iphdr)) return NF_ACCEPT; - ret = nf_nat_fn(hooknum, skb, in, out, okfn); + ret = nf_nat_ipv4_fn(hooknum, skb, in, out, okfn); #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.src.u.all != - ct->tuplehash[!dir].tuple.dst.u.all) - ) - return ip_xfrm_me_harder(skb) == 0 ? ret : NF_DROP; + ct->tuplehash[!dir].tuple.dst.u.all)) + if (nf_xfrm_me_harder(skb, AF_INET) < 0) + ret = NF_DROP; } #endif return ret; } static unsigned int -nf_nat_local_fn(unsigned int hooknum, - struct sk_buff *skb, - const struct net_device *in, - const struct net_device *out, - int (*okfn)(struct sk_buff *)) +nf_nat_ipv4_local_fn(unsigned int hooknum, + struct sk_buff *skb, + const struct net_device *in, + const struct net_device *out, + int (*okfn)(struct sk_buff *)) { const struct nf_conn *ct; enum ip_conntrack_info ctinfo; @@ -219,7 +209,7 @@ nf_nat_local_fn(unsigned int hooknum, ip_hdrlen(skb) < sizeof(struct iphdr)) return NF_ACCEPT; - ret = nf_nat_fn(hooknum, skb, in, out, okfn); + ret = nf_nat_ipv4_fn(hooknum, skb, in, out, okfn); if (ret != NF_DROP && ret != NF_STOLEN && (ct = nf_ct_get(skb, &ctinfo)) != NULL) { enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); @@ -230,21 +220,20 @@ nf_nat_local_fn(unsigned int hooknum, ret = NF_DROP; } #ifdef CONFIG_XFRM - else if (ct->tuplehash[dir].tuple.dst.u.all != + else if (!(IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED) && + ct->tuplehash[dir].tuple.dst.u.all != ct->tuplehash[!dir].tuple.src.u.all) - if (ip_xfrm_me_harder(skb)) + if (nf_xfrm_me_harder(skb, AF_INET) < 0) ret = NF_DROP; #endif } return ret; } -/* We must be after connection tracking and before packet filtering. */ - -static struct nf_hook_ops nf_nat_ops[] __read_mostly = { +static struct nf_hook_ops nf_nat_ipv4_ops[] __read_mostly = { /* Before packet filtering, change destination */ { - .hook = nf_nat_in, + .hook = nf_nat_ipv4_in, .owner = THIS_MODULE, .pf = NFPROTO_IPV4, .hooknum = NF_INET_PRE_ROUTING, @@ -252,7 +241,7 @@ static struct nf_hook_ops nf_nat_ops[] __read_mostly = { }, /* After packet filtering, change source */ { - .hook = nf_nat_out, + .hook = nf_nat_ipv4_out, .owner = THIS_MODULE, .pf = NFPROTO_IPV4, .hooknum = NF_INET_POST_ROUTING, @@ -260,7 +249,7 @@ static struct nf_hook_ops nf_nat_ops[] __read_mostly = { }, /* Before packet filtering, change destination */ { - .hook = nf_nat_local_fn, + .hook = nf_nat_ipv4_local_fn, .owner = THIS_MODULE, .pf = NFPROTO_IPV4, .hooknum = NF_INET_LOCAL_OUT, @@ -268,7 +257,7 @@ static struct nf_hook_ops nf_nat_ops[] __read_mostly = { }, /* After packet filtering, change source */ { - .hook = nf_nat_fn, + .hook = nf_nat_ipv4_fn, .owner = THIS_MODULE, .pf = NFPROTO_IPV4, .hooknum = NF_INET_LOCAL_IN, @@ -276,51 +265,56 @@ static struct nf_hook_ops nf_nat_ops[] __read_mostly = { }, }; -static int __init nf_nat_standalone_init(void) +static int __net_init iptable_nat_net_init(struct net *net) { - int ret = 0; + struct ipt_replace *repl; + + repl = ipt_alloc_initial_table(&nf_nat_ipv4_table); + if (repl == NULL) + return -ENOMEM; + net->ipv4.nat_table = ipt_register_table(net, &nf_nat_ipv4_table, repl); + kfree(repl); + if (IS_ERR(net->ipv4.nat_table)) + return PTR_ERR(net->ipv4.nat_table); + return 0; +} - need_ipv4_conntrack(); +static void __net_exit iptable_nat_net_exit(struct net *net) +{ + ipt_unregister_table(net, net->ipv4.nat_table); +} -#ifdef CONFIG_XFRM - BUG_ON(ip_nat_decode_session != NULL); - RCU_INIT_POINTER(ip_nat_decode_session, nat_decode_session); -#endif - ret = nf_nat_rule_init(); - if (ret < 0) { - pr_err("nf_nat_init: can't setup rules.\n"); - goto cleanup_decode_session; - } - ret = nf_register_hooks(nf_nat_ops, ARRAY_SIZE(nf_nat_ops)); - if (ret < 0) { - pr_err("nf_nat_init: can't register hooks.\n"); - goto cleanup_rule_init; - } - return ret; +static struct pernet_operations iptable_nat_net_ops = { + .init = iptable_nat_net_init, + .exit = iptable_nat_net_exit, +}; - cleanup_rule_init: - nf_nat_rule_cleanup(); - cleanup_decode_session: -#ifdef CONFIG_XFRM - RCU_INIT_POINTER(ip_nat_decode_session, NULL); - synchronize_net(); -#endif - return ret; +static int __init iptable_nat_init(void) +{ + int err; + + err = register_pernet_subsys(&iptable_nat_net_ops); + if (err < 0) + goto err1; + + err = nf_register_hooks(nf_nat_ipv4_ops, ARRAY_SIZE(nf_nat_ipv4_ops)); + if (err < 0) + goto err2; + return 0; + +err2: + unregister_pernet_subsys(&iptable_nat_net_ops); +err1: + return err; } -static void __exit nf_nat_standalone_fini(void) +static void __exit iptable_nat_exit(void) { - nf_unregister_hooks(nf_nat_ops, ARRAY_SIZE(nf_nat_ops)); - nf_nat_rule_cleanup(); -#ifdef CONFIG_XFRM - RCU_INIT_POINTER(ip_nat_decode_session, NULL); - synchronize_net(); -#endif - /* Conntrack caches are unregistered in nf_conntrack_cleanup */ + nf_unregister_hooks(nf_nat_ipv4_ops, ARRAY_SIZE(nf_nat_ipv4_ops)); + unregister_pernet_subsys(&iptable_nat_net_ops); } -module_init(nf_nat_standalone_init); -module_exit(nf_nat_standalone_fini); +module_init(iptable_nat_init); +module_exit(iptable_nat_exit); MODULE_LICENSE("GPL"); -MODULE_ALIAS("ip_nat"); diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c index 4ada3295d9a7..fcdd0c2406e6 100644 --- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c +++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c @@ -29,12 +29,6 @@ #include <net/netfilter/ipv4/nf_defrag_ipv4.h> #include <net/netfilter/nf_log.h> -int (*nf_nat_seq_adjust_hook)(struct sk_buff *skb, - struct nf_conn *ct, - enum ip_conntrack_info ctinfo, - unsigned int protoff); -EXPORT_SYMBOL_GPL(nf_nat_seq_adjust_hook); - static bool ipv4_pkt_to_tuple(const struct sk_buff *skb, unsigned int nhoff, struct nf_conntrack_tuple *tuple) { diff --git a/net/ipv4/netfilter/nf_nat_amanda.c b/net/ipv4/netfilter/nf_nat_amanda.c index 75464b62f5f2..42d337881171 100644 --- a/net/ipv4/netfilter/nf_nat_amanda.c +++ b/net/ipv4/netfilter/nf_nat_amanda.c @@ -16,7 +16,6 @@ #include <net/netfilter/nf_conntrack_helper.h> #include <net/netfilter/nf_conntrack_expect.h> #include <net/netfilter/nf_nat_helper.h> -#include <net/netfilter/nf_nat_rule.h> #include <linux/netfilter/nf_conntrack_amanda.h> MODULE_AUTHOR("Brian J. Murrell <netfilter@interlinx.bc.ca>"); diff --git a/net/ipv4/netfilter/nf_nat_core.c b/net/ipv4/netfilter/nf_nat_core.c deleted file mode 100644 index 44b082fd48ab..000000000000 --- a/net/ipv4/netfilter/nf_nat_core.c +++ /dev/null @@ -1,763 +0,0 @@ -/* NAT for netfilter; shared with compatibility layer. */ - -/* (C) 1999-2001 Paul `Rusty' Russell - * (C) 2002-2006 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. - */ - -#include <linux/module.h> -#include <linux/types.h> -#include <linux/timer.h> -#include <linux/skbuff.h> -#include <linux/gfp.h> -#include <net/checksum.h> -#include <net/icmp.h> -#include <net/ip.h> -#include <net/tcp.h> /* For tcp_prot in getorigdst */ -#include <linux/icmp.h> -#include <linux/udp.h> -#include <linux/jhash.h> - -#include <linux/netfilter_ipv4.h> -#include <net/netfilter/nf_conntrack.h> -#include <net/netfilter/nf_conntrack_core.h> -#include <net/netfilter/nf_nat.h> -#include <net/netfilter/nf_nat_protocol.h> -#include <net/netfilter/nf_nat_core.h> -#include <net/netfilter/nf_nat_helper.h> -#include <net/netfilter/nf_conntrack_helper.h> -#include <net/netfilter/nf_conntrack_l3proto.h> -#include <net/netfilter/nf_conntrack_zones.h> - -static DEFINE_SPINLOCK(nf_nat_lock); - -static struct nf_conntrack_l3proto *l3proto __read_mostly; - -#define MAX_IP_NAT_PROTO 256 -static const struct nf_nat_protocol __rcu *nf_nat_protos[MAX_IP_NAT_PROTO] - __read_mostly; - -static inline const struct nf_nat_protocol * -__nf_nat_proto_find(u_int8_t protonum) -{ - return rcu_dereference(nf_nat_protos[protonum]); -} - -/* We keep an extra hash for each conntrack, for fast searching. */ -static inline unsigned int -hash_by_src(const struct net *net, u16 zone, - const struct nf_conntrack_tuple *tuple) -{ - unsigned int hash; - - /* Original src, to ensure we map it consistently if poss. */ - hash = jhash_3words((__force u32)tuple->src.u3.ip, - (__force u32)tuple->src.u.all ^ zone, - tuple->dst.protonum, nf_conntrack_hash_rnd); - return ((u64)hash * net->ipv4.nat_htable_size) >> 32; -} - -/* Is this tuple already taken? (not by us) */ -int -nf_nat_used_tuple(const struct nf_conntrack_tuple *tuple, - const struct nf_conn *ignored_conntrack) -{ - /* Conntrack tracking doesn't keep track of outgoing tuples; only - incoming ones. NAT means they don't have a fixed mapping, - so we invert the tuple and look for the incoming reply. - - We could keep a separate hash if this proves too slow. */ - struct nf_conntrack_tuple reply; |