summaryrefslogtreecommitdiff
path: root/net/ipv6/netfilter/ip6t_length.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/ipv6/netfilter/ip6t_length.c')
-rw-r--r--net/ipv6/netfilter/ip6t_length.c66
1 files changed, 66 insertions, 0 deletions
diff --git a/net/ipv6/netfilter/ip6t_length.c b/net/ipv6/netfilter/ip6t_length.c
new file mode 100644
index 00000000000..e0537d3811d
--- /dev/null
+++ b/net/ipv6/netfilter/ip6t_length.c
@@ -0,0 +1,66 @@
+/* Length Match - IPv6 Port */
+
+/* (C) 1999-2001 James Morris <jmorros@intercode.com.au>
+ *
+ * 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/skbuff.h>
+#include <linux/netfilter_ipv6/ip6t_length.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>");
+MODULE_DESCRIPTION("IPv6 packet length match");
+
+static int
+match(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *matchinfo,
+ int offset,
+ unsigned int protoff,
+ int *hotdrop)
+{
+ const struct ip6t_length_info *info = matchinfo;
+ u_int16_t pktlen = ntohs(skb->nh.ipv6h->payload_len) + sizeof(struct ipv6hdr);
+
+ return (pktlen >= info->min && pktlen <= info->max) ^ info->invert;
+}
+
+static int
+checkentry(const char *tablename,
+ const struct ip6t_ip6 *ip,
+ void *matchinfo,
+ unsigned int matchsize,
+ unsigned int hook_mask)
+{
+ if (matchsize != IP6T_ALIGN(sizeof(struct ip6t_length_info)))
+ return 0;
+
+ return 1;
+}
+
+static struct ip6t_match length_match = {
+ .name = "length",
+ .match = &match,
+ .checkentry = &checkentry,
+ .me = THIS_MODULE,
+};
+
+static int __init init(void)
+{
+ return ip6t_register_match(&length_match);
+}
+
+static void __exit fini(void)
+{
+ ip6t_unregister_match(&length_match);
+}
+
+module_init(init);
+module_exit(fini);