From 2cbc78a29e76a2e92c172651204f3117491877d2 Mon Sep 17 00:00:00 2001 From: Jan Engelhardt Date: Fri, 21 Sep 2012 11:41:34 +0200 Subject: [PATCH] netfilter: combine ipt_REDIRECT and ip6t_REDIRECT Combine more modules since the actual code is so small anyway that the kmod metadata and the module in its loaded state totally outweighs the combined actual code size. IP_NF_TARGET_REDIRECT becomes a compat option; IP6_NF_TARGET_REDIRECT is completely eliminated since it has not see a release yet. Signed-off-by: Jan Engelhardt Acked-by: Patrick McHardy Signed-off-by: Pablo Neira Ayuso --- net/ipv4/netfilter/Kconfig | 12 +- net/ipv4/netfilter/Makefile | 1 - net/ipv4/netfilter/ipt_REDIRECT.c | 113 ----------------- net/ipv6/netfilter/Kconfig | 10 -- net/ipv6/netfilter/Makefile | 1 - net/ipv6/netfilter/ip6t_REDIRECT.c | 98 --------------- net/netfilter/Kconfig | 11 ++ net/netfilter/Makefile | 1 + net/netfilter/xt_REDIRECT.c | 190 +++++++++++++++++++++++++++++ 9 files changed, 207 insertions(+), 230 deletions(-) delete mode 100644 net/ipv4/netfilter/ipt_REDIRECT.c delete mode 100644 net/ipv6/netfilter/ip6t_REDIRECT.c create mode 100644 net/netfilter/xt_REDIRECT.c diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig index 6f140084004..d8d6f2a5bf1 100644 --- a/net/ipv4/netfilter/Kconfig +++ b/net/ipv4/netfilter/Kconfig @@ -181,13 +181,11 @@ config IP_NF_TARGET_NETMAP config IP_NF_TARGET_REDIRECT tristate "REDIRECT target support" depends on NETFILTER_ADVANCED - help - REDIRECT is a special case of NAT: all incoming connections are - mapped onto the incoming interface's address, causing the packets to - come to the local machine instead of passing through. This is - useful for transparent proxies. - - To compile it as a module, choose M here. If unsure, say N. + select NETFILTER_XT_TARGET_REDIRECT + ---help--- + This is a backwards-compat option for the user's convenience + (e.g. when running oldconfig). It selects + CONFIG_NETFILTER_XT_TARGET_REDIRECT. endif diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile index f4446c5d659..007b128eecc 100644 --- a/net/ipv4/netfilter/Makefile +++ b/net/ipv4/netfilter/Makefile @@ -45,7 +45,6 @@ obj-$(CONFIG_IP_NF_MATCH_RPFILTER) += ipt_rpfilter.o obj-$(CONFIG_IP_NF_TARGET_CLUSTERIP) += ipt_CLUSTERIP.o obj-$(CONFIG_IP_NF_TARGET_ECN) += ipt_ECN.o obj-$(CONFIG_IP_NF_TARGET_MASQUERADE) += ipt_MASQUERADE.o -obj-$(CONFIG_IP_NF_TARGET_REDIRECT) += ipt_REDIRECT.o obj-$(CONFIG_IP_NF_TARGET_REJECT) += ipt_REJECT.o obj-$(CONFIG_IP_NF_TARGET_ULOG) += ipt_ULOG.o diff --git a/net/ipv4/netfilter/ipt_REDIRECT.c b/net/ipv4/netfilter/ipt_REDIRECT.c deleted file mode 100644 index 11407d7d247..00000000000 --- a/net/ipv4/netfilter/ipt_REDIRECT.c +++ /dev/null @@ -1,113 +0,0 @@ -/* Redirect. Simple mapping which alters dst to a local IP address. */ -/* (C) 1999-2001 Paul `Rusty' Russell - * (C) 2002-2006 Netfilter Core Team - * - * 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. - */ -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Netfilter Core Team "); -MODULE_DESCRIPTION("Xtables: Connection redirection to localhost"); - -/* FIXME: Take multiple ranges --RR */ -static int redirect_tg_check(const struct xt_tgchk_param *par) -{ - const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo; - - if (mr->range[0].flags & NF_NAT_RANGE_MAP_IPS) { - pr_debug("bad MAP_IPS.\n"); - return -EINVAL; - } - if (mr->rangesize != 1) { - pr_debug("bad rangesize %u.\n", mr->rangesize); - return -EINVAL; - } - return 0; -} - -static unsigned int -redirect_tg(struct sk_buff *skb, const struct xt_action_param *par) -{ - struct nf_conn *ct; - enum ip_conntrack_info ctinfo; - __be32 newdst; - const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo; - struct nf_nat_range newrange; - - NF_CT_ASSERT(par->hooknum == NF_INET_PRE_ROUTING || - par->hooknum == NF_INET_LOCAL_OUT); - - ct = nf_ct_get(skb, &ctinfo); - NF_CT_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED)); - - /* Local packets: make them go to loopback */ - if (par->hooknum == NF_INET_LOCAL_OUT) - newdst = htonl(0x7F000001); - else { - struct in_device *indev; - struct in_ifaddr *ifa; - - newdst = 0; - - rcu_read_lock(); - indev = __in_dev_get_rcu(skb->dev); - if (indev && (ifa = indev->ifa_list)) - newdst = ifa->ifa_local; - rcu_read_unlock(); - - if (!newdst) - return NF_DROP; - } - - /* Transfer from original range. */ - 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); -} - -static struct xt_target redirect_tg_reg __read_mostly = { - .name = "REDIRECT", - .family = NFPROTO_IPV4, - .target = redirect_tg, - .targetsize = sizeof(struct nf_nat_ipv4_multi_range_compat), - .table = "nat", - .hooks = (1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_OUT), - .checkentry = redirect_tg_check, - .me = THIS_MODULE, -}; - -static int __init redirect_tg_init(void) -{ - return xt_register_target(&redirect_tg_reg); -} - -static void __exit redirect_tg_exit(void) -{ - xt_unregister_target(&redirect_tg_reg); -} - -module_init(redirect_tg_init); -module_exit(redirect_tg_exit); diff --git a/net/ipv6/netfilter/Kconfig b/net/ipv6/netfilter/Kconfig index 007bb450f04..c72532a60d8 100644 --- a/net/ipv6/netfilter/Kconfig +++ b/net/ipv6/netfilter/Kconfig @@ -209,16 +209,6 @@ config IP6_NF_TARGET_MASQUERADE To compile it as a module, choose M here. If unsure, say N. -config IP6_NF_TARGET_REDIRECT - tristate "REDIRECT target support" - help - REDIRECT is a special case of NAT: all incoming connections are - mapped onto the incoming interface's address, causing the packets to - come to the local machine instead of passing through. This is - useful for transparent proxies. - - To compile it as a module, choose M here. If unsure, say N. - config IP6_NF_TARGET_NPT tristate "NPT (Network Prefix translation) target support" help diff --git a/net/ipv6/netfilter/Makefile b/net/ipv6/netfilter/Makefile index de8e0d11338..2d11fcc2cf3 100644 --- a/net/ipv6/netfilter/Makefile +++ b/net/ipv6/netfilter/Makefile @@ -36,5 +36,4 @@ obj-$(CONFIG_IP6_NF_MATCH_RT) += ip6t_rt.o # targets obj-$(CONFIG_IP6_NF_TARGET_MASQUERADE) += ip6t_MASQUERADE.o obj-$(CONFIG_IP6_NF_TARGET_NPT) += ip6t_NPT.o -obj-$(CONFIG_IP6_NF_TARGET_REDIRECT) += ip6t_REDIRECT.o obj-$(CONFIG_IP6_NF_TARGET_REJECT) += ip6t_REJECT.o diff --git a/net/ipv6/netfilter/ip6t_REDIRECT.c b/net/ipv6/netfilter/ip6t_REDIRECT.c deleted file mode 100644 index 60497a3c600..00000000000 --- a/net/ipv6/netfilter/ip6t_REDIRECT.c +++ /dev/null @@ -1,98 +0,0 @@ -/* - * Copyright (c) 2011 Patrick McHardy - * - * 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. - * - * Based on Rusty Russell's IPv4 REDIRECT target. Development of IPv6 - * NAT funded by Astaro. - */ - -#include -#include -#include -#include -#include -#include -#include - -static const struct in6_addr loopback_addr = IN6ADDR_LOOPBACK_INIT; - -static unsigned int -redirect_tg6(struct sk_buff *skb, const struct xt_action_param *par) -{ - const struct nf_nat_range *range = par->targinfo; - struct nf_nat_range newrange; - struct in6_addr newdst; - enum ip_conntrack_info ctinfo; - struct nf_conn *ct; - - ct = nf_ct_get(skb, &ctinfo); - if (par->hooknum == NF_INET_LOCAL_OUT) - newdst = loopback_addr; - else { - struct inet6_dev *idev; - struct inet6_ifaddr *ifa; - bool addr = false; - - rcu_read_lock(); - idev = __in6_dev_get(skb->dev); - if (idev != NULL) { - list_for_each_entry(ifa, &idev->addr_list, if_list) { - newdst = ifa->addr; - addr = true; - break; - } - } - rcu_read_unlock(); - - if (!addr) - return NF_DROP; - } - - newrange.flags = range->flags | NF_NAT_RANGE_MAP_IPS; - newrange.min_addr.in6 = newdst; - newrange.max_addr.in6 = newdst; - newrange.min_proto = range->min_proto; - newrange.max_proto = range->max_proto; - - return nf_nat_setup_info(ct, &newrange, NF_NAT_MANIP_DST); -} - -static int redirect_tg6_checkentry(const struct xt_tgchk_param *par) -{ - const struct nf_nat_range *range = par->targinfo; - - if (range->flags & NF_NAT_RANGE_MAP_IPS) - return -EINVAL; - return 0; -} - -static struct xt_target redirect_tg6_reg __read_mostly = { - .name = "REDIRECT", - .family = NFPROTO_IPV6, - .checkentry = redirect_tg6_checkentry, - .target = redirect_tg6, - .targetsize = sizeof(struct nf_nat_range), - .table = "nat", - .hooks = (1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_OUT), - .me = THIS_MODULE, -}; - -static int __init redirect_tg6_init(void) -{ - return xt_register_target(&redirect_tg6_reg); -} - -static void __exit redirect_tg6_exit(void) -{ - xt_unregister_target(&redirect_tg6_reg); -} - -module_init(redirect_tg6_init); -module_exit(redirect_tg6_exit); - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Patrick McHardy "); -MODULE_DESCRIPTION("Xtables: Connection redirection to localhost"); diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig index ad0e0da62ed..fefa514b991 100644 --- a/net/netfilter/Kconfig +++ b/net/netfilter/Kconfig @@ -690,6 +690,17 @@ config NETFILTER_XT_TARGET_RATEEST To compile it as a module, choose M here. If unsure, say N. +config NETFILTER_XT_TARGET_REDIRECT + tristate "REDIRECT target support" + depends on NF_NAT + ---help--- + REDIRECT is a special case of NAT: all incoming connections are + mapped onto the incoming interface's address, causing the packets to + come to the local machine instead of passing through. This is + useful for transparent proxies. + + To compile it as a module, choose M here. If unsure, say N. + config NETFILTER_XT_TARGET_TEE tristate '"TEE" - packet cloning to alternate destination' depends on NETFILTER_ADVANCED diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile index 600d28ba514..32596978df1 100644 --- a/net/netfilter/Makefile +++ b/net/netfilter/Makefile @@ -87,6 +87,7 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_NETMAP) += xt_NETMAP.o obj-$(CONFIG_NETFILTER_XT_TARGET_NFLOG) += xt_NFLOG.o obj-$(CONFIG_NETFILTER_XT_TARGET_NFQUEUE) += xt_NFQUEUE.o obj-$(CONFIG_NETFILTER_XT_TARGET_RATEEST) += xt_RATEEST.o +obj-$(CONFIG_NETFILTER_XT_TARGET_REDIRECT) += xt_REDIRECT.o obj-$(CONFIG_NETFILTER_XT_TARGET_SECMARK) += xt_SECMARK.o obj-$(CONFIG_NETFILTER_XT_TARGET_TPROXY) += xt_TPROXY.o obj-$(CONFIG_NETFILTER_XT_TARGET_TCPMSS) += xt_TCPMSS.o diff --git a/net/netfilter/xt_REDIRECT.c b/net/netfilter/xt_REDIRECT.c new file mode 100644 index 00000000000..22a10309297 --- /dev/null +++ b/net/netfilter/xt_REDIRECT.c @@ -0,0 +1,190 @@ +/* + * (C) 1999-2001 Paul `Rusty' Russell + * (C) 2002-2006 Netfilter Core Team + * Copyright (c) 2011 Patrick McHardy + * + * 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. + * + * Based on Rusty Russell's IPv4 REDIRECT target. Development of IPv6 + * NAT funded by Astaro. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static const struct in6_addr loopback_addr = IN6ADDR_LOOPBACK_INIT; + +static unsigned int +redirect_tg6(struct sk_buff *skb, const struct xt_action_param *par) +{ + const struct nf_nat_range *range = par->targinfo; + struct nf_nat_range newrange; + struct in6_addr newdst; + enum ip_conntrack_info ctinfo; + struct nf_conn *ct; + + ct = nf_ct_get(skb, &ctinfo); + if (par->hooknum == NF_INET_LOCAL_OUT) + newdst = loopback_addr; + else { + struct inet6_dev *idev; + struct inet6_ifaddr *ifa; + bool addr = false; + + rcu_read_lock(); + idev = __in6_dev_get(skb->dev); + if (idev != NULL) { + list_for_each_entry(ifa, &idev->addr_list, if_list) { + newdst = ifa->addr; + addr = true; + break; + } + } + rcu_read_unlock(); + + if (!addr) + return NF_DROP; + } + + newrange.flags = range->flags | NF_NAT_RANGE_MAP_IPS; + newrange.min_addr.in6 = newdst; + newrange.max_addr.in6 = newdst; + newrange.min_proto = range->min_proto; + newrange.max_proto = range->max_proto; + + return nf_nat_setup_info(ct, &newrange, NF_NAT_MANIP_DST); +} + +static int redirect_tg6_checkentry(const struct xt_tgchk_param *par) +{ + const struct nf_nat_range *range = par->targinfo; + + if (range->flags & NF_NAT_RANGE_MAP_IPS) + return -EINVAL; + return 0; +} + +/* FIXME: Take multiple ranges --RR */ +static int redirect_tg4_check(const struct xt_tgchk_param *par) +{ + const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo; + + if (mr->range[0].flags & NF_NAT_RANGE_MAP_IPS) { + pr_debug("bad MAP_IPS.\n"); + return -EINVAL; + } + if (mr->rangesize != 1) { + pr_debug("bad rangesize %u.\n", mr->rangesize); + return -EINVAL; + } + return 0; +} + +static unsigned int +redirect_tg4(struct sk_buff *skb, const struct xt_action_param *par) +{ + struct nf_conn *ct; + enum ip_conntrack_info ctinfo; + __be32 newdst; + const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo; + struct nf_nat_range newrange; + + NF_CT_ASSERT(par->hooknum == NF_INET_PRE_ROUTING || + par->hooknum == NF_INET_LOCAL_OUT); + + ct = nf_ct_get(skb, &ctinfo); + NF_CT_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED)); + + /* Local packets: make them go to loopback */ + if (par->hooknum == NF_INET_LOCAL_OUT) + newdst = htonl(0x7F000001); + else { + struct in_device *indev; + struct in_ifaddr *ifa; + + newdst = 0; + + rcu_read_lock(); + indev = __in_dev_get_rcu(skb->dev); + if (indev && (ifa = indev->ifa_list)) + newdst = ifa->ifa_local; + rcu_read_unlock(); + + if (!newdst) + return NF_DROP; + } + + /* Transfer from original range. */ + 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); +} + +static struct xt_target redirect_tg_reg[] __read_mostly = { + { + .name = "REDIRECT", + .family = NFPROTO_IPV6, + .revision = 0, + .table = "nat", + .checkentry = redirect_tg6_checkentry, + .target = redirect_tg6, + .targetsize = sizeof(struct nf_nat_range), + .hooks = (1 << NF_INET_PRE_ROUTING) | + (1 << NF_INET_LOCAL_OUT), + .me = THIS_MODULE, + }, + { + .name = "REDIRECT", + .family = NFPROTO_IPV4, + .revision = 0, + .table = "nat", + .target = redirect_tg4, + .checkentry = redirect_tg4_check, + .targetsize = sizeof(struct nf_nat_ipv4_multi_range_compat), + .hooks = (1 << NF_INET_PRE_ROUTING) | + (1 << NF_INET_LOCAL_OUT), + .me = THIS_MODULE, + }, +}; + +static int __init redirect_tg_init(void) +{ + return xt_register_targets(redirect_tg_reg, + ARRAY_SIZE(redirect_tg_reg)); +} + +static void __exit redirect_tg_exit(void) +{ + xt_unregister_targets(redirect_tg_reg, ARRAY_SIZE(redirect_tg_reg)); +} + +module_init(redirect_tg_init); +module_exit(redirect_tg_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Patrick McHardy "); +MODULE_DESCRIPTION("Xtables: Connection redirection to localhost"); +MODULE_ALIAS("ip6t_REDIRECT"); +MODULE_ALIAS("ipt_REDIRECT");