commit 375972a6ff3579f150bf916621b6fe752d29f25a
Author: Jan Engelhardt <jengelh@xxxxxxxxxxxxxxx>
Date: Wed Jan 2 17:52:04 2008 +0100
[NETFILTER]: xt_connmark match, revision 1
Introduces the xt_connmark match revision 1. It uses fixed types,
eventually obsoleting revision 0 some day (uses nonfixed types).
(Unfixed types like "unsigned long" do not play well with mixed
user-/kernelspace "bitness", e.g. 32/64, as is common on SPARC64,
and need extra compat code.)
Signed-off-by: Jan Engelhardt <jengelh@xxxxxxxxxxxxxxx>
include/linux/netfilter/xt_connmark.h | 5 ++
net/netfilter/xt_connmark.c | 84 ++++++++++++++++++++-----
2 files changed, 74 insertions(+), 15 deletions(-)
diff --git a/include/linux/netfilter/xt_connmark.h b/include/linux/netfilter/xt_connmark.h
index c592f6a..359ef86 100644
--- a/include/linux/netfilter/xt_connmark.h
+++ b/include/linux/netfilter/xt_connmark.h
@@ -15,4 +15,9 @@ struct xt_connmark_info {
u_int8_t invert;
};
+struct xt_connmark_mtinfo1 {
+ u_int32_t mark, mask;
+ u_int8_t invert;
+};
+
#endif /*_XT_CONNMARK_H*/
diff --git a/net/netfilter/xt_connmark.c b/net/netfilter/xt_connmark.c
index 8ad875b..60d9605 100644
--- a/net/netfilter/xt_connmark.c
+++ b/net/netfilter/xt_connmark.c
@@ -1,8 +1,10 @@
-/* This kernel module matches connection mark values set by the
- * CONNMARK target
+/*
+ * xt_connmark - Netfilter module to match connection mark values
*
- * Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
- * by Henrik Nordstrom <hno@xxxxxxxxxxxxxxx>
+ * Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
+ * by Henrik Nordstrom <hno@xxxxxxxxxxxxxxx>
+ * Copyright © CC Computer Consultants GmbH, 2007 - 2008
+ * Jan Engelhardt <jengelh@xxxxxxxxxxxxxxx>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -37,6 +39,23 @@ connmark_mt(const struct sk_buff *skb, const struct net_device *in,
const void *matchinfo, int offset, unsigned int protoff,
bool *hotdrop)
{
+ const struct xt_connmark_mtinfo1 *info = matchinfo;
+ enum ip_conntrack_info ctinfo;
+ const struct nf_conn *ct;
+
+ ct = nf_ct_get(skb, &ctinfo);
+ if (ct == NULL)
+ return false;
+
+ return ((ct->mark & info->mask) == info->mark) ^ info->invert;
+}
+
+static bool
+connmark_mt_v0(const struct sk_buff *skb, const struct net_device *in,
+ const struct net_device *out, const struct xt_match *match,
+ const void *matchinfo, int offset, unsigned int protoff,
+ bool *hotdrop)
+{
const struct xt_connmark_info *info = matchinfo;
const struct nf_conn *ct;
enum ip_conntrack_info ctinfo;
@@ -49,9 +68,9 @@ connmark_mt(const struct sk_buff *skb, const struct net_device *in,
}
static bool
-connmark_mt_check(const char *tablename, const void *ip,
- const struct xt_match *match, void *matchinfo,
- unsigned int hook_mask)
+connmark_mt_check_v0(const char *tablename, const void *ip,
+ const struct xt_match *match, void *matchinfo,
+ unsigned int hook_mask)
{
const struct xt_connmark_info *cm = matchinfo;
@@ -67,6 +86,19 @@ connmark_mt_check(const char *tablename, const void *ip,
return true;
}
+static bool
+connmark_mt_check(const char *tablename, const void *ip,
+ const struct xt_match *match, void *matchinfo,
+ unsigned int hook_mask)
+{
+ if (nf_ct_l3proto_try_module_get(match->family) < 0) {
+ printk(KERN_WARNING "cannot load conntrack support for "
+ "proto=%u\n", match->family);
+ return false;
+ }
+ return true;
+}
+
static void
connmark_mt_destroy(const struct xt_match *match, void *matchinfo)
{
@@ -81,7 +113,7 @@ struct compat_xt_connmark_info {
u_int16_t __pad2;
};
-static void connmark_mt_compat_from_user(void *dst, void *src)
+static void connmark_mt_compat_from_user_v0(void *dst, void *src)
{
const struct compat_xt_connmark_info *cm = src;
struct xt_connmark_info m = {
@@ -92,7 +124,7 @@ static void connmark_mt_compat_from_user(void *dst, void *src)
memcpy(dst, &m, sizeof(m));
}
-static int connmark_mt_compat_to_user(void __user *dst, void *src)
+static int connmark_mt_compat_to_user_v0(void __user *dst, void *src)
{
const struct xt_connmark_info *m = src;
struct compat_xt_connmark_info cm = {
@@ -107,23 +139,25 @@ static int connmark_mt_compat_to_user(void __user *dst, void *src)
static struct xt_match connmark_mt_reg[] __read_mostly = {
{
.name = "connmark",
+ .revision = 0,
.family = AF_INET,
- .checkentry = connmark_mt_check,
- .match = connmark_mt,
+ .checkentry = connmark_mt_check_v0,
+ .match = connmark_mt_v0,
.destroy = connmark_mt_destroy,
.matchsize = sizeof(struct xt_connmark_info),
#ifdef CONFIG_COMPAT
.compatsize = sizeof(struct compat_xt_connmark_info),
- .compat_from_user = connmark_mt_compat_from_user,
- .compat_to_user = connmark_mt_compat_to_user,
+ .compat_from_user = connmark_mt_compat_from_user_v0,
+ .compat_to_user = connmark_mt_compat_to_user_v0,
#endif
.me = THIS_MODULE
},
{
.name = "connmark",
+ .revision = 0,
.family = AF_INET6,
- .checkentry = connmark_mt_check,
- .match = connmark_mt,
+ .checkentry = connmark_mt_check_v0,
+ .match = connmark_mt_v0,
.destroy = connmark_mt_destroy,
.matchsize = sizeof(struct xt_connmark_info),
#ifdef CONFIG_COMPAT
@@ -133,6 +167,26 @@ static struct xt_match connmark_mt_reg[] __read_mostly = {
#endif
.me = THIS_MODULE
},
+ {
+ .name = "connmark",
+ .revision = 1,
+ .family = AF_INET,
+ .checkentry = connmark_mt_check,
+ .match = connmark_mt,
+ .matchsize = sizeof(struct xt_connmark_mtinfo1),
+ .destroy = connmark_mt_destroy,
+ .me = THIS_MODULE,
+ },
+ {
+ .name = "connmark",
+ .revision = 1,
+ .family = AF_INET6,
+ .checkentry = connmark_mt_check,
+ .match = connmark_mt,
+ .matchsize = sizeof(struct xt_connmark_mtinfo1),
+ .destroy = connmark_mt_destroy,
+ .me = THIS_MODULE,
+ },
};
static int __init connmark_mt_init(void)
-
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