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authorJan Engelhardt <jengelh@medozas.de>2011-06-09 21:03:07 +0200
committerPablo Neira Ayuso <pablo@netfilter.org>2011-12-27 20:31:31 +0100
commitd446a8202c81d95f91b1682fc67e7fadd9a31389 (patch)
treee3e7dcc79eab38846b53af613929b68aa0318752 /net/ipv4
parentc0d2b8376ae2d74aa862e946a372502603e9066d (diff)
downloadblackbird-op-linux-d446a8202c81d95f91b1682fc67e7fadd9a31389.tar.gz
blackbird-op-linux-d446a8202c81d95f91b1682fc67e7fadd9a31389.zip
netfilter: xtables: move ipt_ecn to xt_ecn
Prepare the ECN match for augmentation by an IPv6 counterpart. Since no symbol dependencies to ipv6.ko are added, having a single ecn match module is the more so welcome. Signed-off-by: Jan Engelhardt <jengelh@medozas.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/netfilter/Kconfig10
-rw-r--r--net/ipv4/netfilter/Makefile1
-rw-r--r--net/ipv4/netfilter/ipt_ecn.c127
3 files changed, 5 insertions, 133 deletions
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index 7e1f5cdaf11e..53b9c79c8025 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -76,11 +76,11 @@ config IP_NF_MATCH_AH
config IP_NF_MATCH_ECN
tristate '"ecn" match support'
depends on NETFILTER_ADVANCED
- help
- This option adds a `ECN' match, which allows you to match against
- the IPv4 and TCP header ECN fields.
-
- To compile it as a module, choose M here. If unsure, say N.
+ select NETFILTER_XT_MATCH_ECN
+ ---help---
+ This is a backwards-compat option for the user's convenience
+ (e.g. when running oldconfig). It selects
+ CONFIG_NETFILTER_XT_MATCH_ECN.
config IP_NF_MATCH_RPFILTER
tristate '"rpfilter" reverse path filter match support'
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index 123dd88cea53..213a462b739b 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -49,7 +49,6 @@ obj-$(CONFIG_IP_NF_SECURITY) += iptable_security.o
# matches
obj-$(CONFIG_IP_NF_MATCH_AH) += ipt_ah.o
-obj-$(CONFIG_IP_NF_MATCH_ECN) += ipt_ecn.o
obj-$(CONFIG_IP_NF_MATCH_RPFILTER) += ipt_rpfilter.o
# targets
diff --git a/net/ipv4/netfilter/ipt_ecn.c b/net/ipv4/netfilter/ipt_ecn.c
deleted file mode 100644
index 2b57e52c746c..000000000000
--- a/net/ipv4/netfilter/ipt_ecn.c
+++ /dev/null
@@ -1,127 +0,0 @@
-/* IP tables module for matching the value of the IPv4 and TCP ECN bits
- *
- * (C) 2002 by Harald Welte <laforge@gnumonks.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.
- */
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-#include <linux/in.h>
-#include <linux/ip.h>
-#include <net/ip.h>
-#include <linux/module.h>
-#include <linux/skbuff.h>
-#include <linux/tcp.h>
-
-#include <linux/netfilter/x_tables.h>
-#include <linux/netfilter_ipv4/ip_tables.h>
-#include <linux/netfilter_ipv4/ipt_ecn.h>
-
-MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
-MODULE_DESCRIPTION("Xtables: Explicit Congestion Notification (ECN) flag match for IPv4");
-MODULE_LICENSE("GPL");
-
-static inline bool match_ip(const struct sk_buff *skb,
- const struct ipt_ecn_info *einfo)
-{
- return ((ip_hdr(skb)->tos & IPT_ECN_IP_MASK) == einfo->ip_ect) ^
- !!(einfo->invert & IPT_ECN_OP_MATCH_IP);
-}
-
-static inline bool match_tcp(const struct sk_buff *skb,
- const struct ipt_ecn_info *einfo,
- bool *hotdrop)
-{
- struct tcphdr _tcph;
- const struct tcphdr *th;
-
- /* In practice, TCP match does this, so can't fail. But let's
- * be good citizens.
- */
- th = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(_tcph), &_tcph);
- if (th == NULL) {
- *hotdrop = false;
- return false;
- }
-
- if (einfo->operation & IPT_ECN_OP_MATCH_ECE) {
- if (einfo->invert & IPT_ECN_OP_MATCH_ECE) {
- if (th->ece == 1)
- return false;
- } else {
- if (th->ece == 0)
- return false;
- }
- }
-
- if (einfo->operation & IPT_ECN_OP_MATCH_CWR) {
- if (einfo->invert & IPT_ECN_OP_MATCH_CWR) {
- if (th->cwr == 1)
- return false;
- } else {
- if (th->cwr == 0)
- return false;
- }
- }
-
- return true;
-}
-
-static bool ecn_mt(const struct sk_buff *skb, struct xt_action_param *par)
-{
- const struct ipt_ecn_info *info = par->matchinfo;
-
- if (info->operation & IPT_ECN_OP_MATCH_IP)
- if (!match_ip(skb, info))
- return false;
-
- if (info->operation & (IPT_ECN_OP_MATCH_ECE|IPT_ECN_OP_MATCH_CWR)) {
- if (!match_tcp(skb, info, &par->hotdrop))
- return false;
- }
-
- return true;
-}
-
-static int ecn_mt_check(const struct xt_mtchk_param *par)
-{
- const struct ipt_ecn_info *info = par->matchinfo;
- const struct ipt_ip *ip = par->entryinfo;
-
- if (info->operation & IPT_ECN_OP_MATCH_MASK)
- return -EINVAL;
-
- if (info->invert & IPT_ECN_OP_MATCH_MASK)
- return -EINVAL;
-
- if (info->operation & (IPT_ECN_OP_MATCH_ECE|IPT_ECN_OP_MATCH_CWR) &&
- (ip->proto != IPPROTO_TCP || ip->invflags & IPT_INV_PROTO)) {
- pr_info("cannot match TCP bits in rule for non-tcp packets\n");
- return -EINVAL;
- }
-
- return 0;
-}
-
-static struct xt_match ecn_mt_reg __read_mostly = {
- .name = "ecn",
- .family = NFPROTO_IPV4,
- .match = ecn_mt,
- .matchsize = sizeof(struct ipt_ecn_info),
- .checkentry = ecn_mt_check,
- .me = THIS_MODULE,
-};
-
-static int __init ecn_mt_init(void)
-{
- return xt_register_match(&ecn_mt_reg);
-}
-
-static void __exit ecn_mt_exit(void)
-{
- xt_unregister_match(&ecn_mt_reg);
-}
-
-module_init(ecn_mt_init);
-module_exit(ecn_mt_exit);
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