commit 057131958a0e09403fc47090549fe9d25afd763c
Author: Jan Engelhardt <jengelh@xxxxxxxxxxxxxxx>
Date: Wed Jan 2 18:51:10 2008 +0100
[NETFILTER]: xt_iprange match, revision 1
Adds IPv6 support to xt_iprange, making it possible to match on IPv6
address ranges with ip6tables.
Signed-off-by: Jan Engelhardt <jengelh@xxxxxxxxxxxxxxx>
net/netfilter/xt_iprange.c | 123 +++++++++++++++++++++++++++++++++---
1 files changed, 114 insertions(+), 9 deletions(-)
diff --git a/net/netfilter/xt_iprange.c b/net/netfilter/xt_iprange.c
index ff71868..cd08f17 100644
--- a/net/netfilter/xt_iprange.c
+++ b/net/netfilter/xt_iprange.c
@@ -2,6 +2,8 @@
* xt_iprange - Netfilter module to match IP address ranges
*
* (C) 2003 Jozsef Kadlecsik <kadlec@xxxxxxxxxxxxxxxxx>
+ * Copyright © CC Computer Consultants GmbH, 2008
+ * Contact: <jengelh@xxxxxxxxxxxxxxx>
*
* 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
@@ -10,6 +12,7 @@
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
+#include <linux/ipv6.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter_ipv4/ipt_iprange.h>
@@ -51,26 +54,128 @@ iprange_mt_v0(const struct sk_buff *skb, const struct net_device *in,
return true;
}
-static struct xt_match iprange_mt_reg __read_mostly = {
- .name = "iprange",
- .family = AF_INET,
- .match = iprange_mt_v0,
- .matchsize = sizeof(struct ipt_iprange_info),
- .me = THIS_MODULE
+static bool
+iprange_mt4(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_iprange_mtinfo *info = matchinfo;
+ const struct iphdr *iph = ip_hdr(skb);
+ bool m;
+
+ if (info->flags & IPRANGE_SRC) {
+ m = ntohl(iph->saddr) < ntohl(info->src_min.ip);
+ m |= ntohl(iph->saddr) > ntohl(info->src_max.ip);
+ m ^= info->flags & IPRANGE_SRC_INV;
+ if (m) {
+ pr_debug("src IP " NIPQUAD_FMT " NOT in range %s"
+ NIPQUAD_FMT "-" NIPQUAD_FMT "\n",
+ NIPQUAD(iph->saddr),
+ (info->flags & IPRANGE_SRC_INV) ? "(INV) " : "",
+ NIPQUAD(info->src_max.ip),
+ NIPQUAD(info->src_max.ip));
+ return false;
+ }
+ }
+ if (info->flags & IPRANGE_DST) {
+ m = ntohl(iph->daddr) < ntohl(info->dst_min.ip);
+ m |= ntohl(iph->daddr) > ntohl(info->dst_max.ip);
+ m ^= info->flags & IPRANGE_DST_INV;
+ if (m) {
+ pr_debug("dst IP " NIPQUAD_FMT " NOT in range %s"
+ NIPQUAD_FMT "-" NIPQUAD_FMT "\n",
+ NIPQUAD(iph->daddr),
+ (info->flags & IPRANGE_DST_INV) ? "(INV) " : "",
+ NIPQUAD(info->dst_min.ip),
+ NIPQUAD(info->dst_max.ip));
+ return false;
+ }
+ }
+ return true;
+}
+
+static inline int
+iprange_ipv6_sub(const struct in6_addr *a, const struct in6_addr *b)
+{
+ unsigned int i;
+ int r;
+
+ for (i = 0; i < 4; ++i) {
+ r = a->s6_addr32[i] - b->s6_addr32[i];
+ if (r != 0)
+ return r;
+ }
+
+ return 0;
+}
+
+static bool
+iprange_mt6(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_iprange_mtinfo *info = matchinfo;
+ const struct ipv6hdr *iph = ipv6_hdr(skb);
+ bool m;
+
+ if (info->flags & IPRANGE_SRC) {
+ m = iprange_ipv6_sub(&iph->saddr, &info->src_min.in6) < 0;
+ m |= iprange_ipv6_sub(&iph->saddr, &info->src_max.in6) > 0;
+ m ^= info->flags & IPRANGE_SRC_INV;
+ if (m)
+ return false;
+ }
+ if (info->flags & IPRANGE_DST) {
+ m = iprange_ipv6_sub(&iph->daddr, &info->dst_min.in6) < 0;
+ m |= iprange_ipv6_sub(&iph->daddr, &info->dst_max.in6) > 0;
+ m ^= info->flags & IPRANGE_DST_INV;
+ if (m)
+ return false;
+ }
+ return true;
+}
+
+static struct xt_match iprange_mt_reg[] __read_mostly = {
+ {
+ .name = "iprange",
+ .revision = 0,
+ .family = AF_INET,
+ .match = iprange_mt_v0,
+ .matchsize = sizeof(struct ipt_iprange_info),
+ .me = THIS_MODULE,
+ },
+ {
+ .name = "iprange",
+ .revision = 1,
+ .family = AF_INET6,
+ .match = iprange_mt4,
+ .matchsize = sizeof(struct xt_iprange_mtinfo),
+ .me = THIS_MODULE,
+ },
+ {
+ .name = "iprange",
+ .revision = 1,
+ .family = AF_INET6,
+ .match = iprange_mt6,
+ .matchsize = sizeof(struct xt_iprange_mtinfo),
+ .me = THIS_MODULE,
+ },
};
static int __init iprange_mt_init(void)
{
- return xt_register_match(&iprange_mt_reg);
+ return xt_register_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg));
}
static void __exit iprange_mt_exit(void)
{
- xt_unregister_match(&iprange_mt_reg);
+ xt_unregister_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg));
}
module_init(iprange_mt_init);
module_exit(iprange_mt_exit);
MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@xxxxxxxxxxxxxxxxx>");
+MODULE_AUTHOR("Jan Engelhardt <jengelh@xxxxxxxxxxxxxxx>, Jozsef Kadlecsik <kadlec@xxxxxxxxxxxxxxxxx>");
MODULE_DESCRIPTION("Netfilter: arbitrary IPv4 range matching");
-
To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
