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Diffstat (limited to 'release/src/linux/linux/net/ipv4/netfilter/ipt_TTL.c')
-rw-r--r--release/src/linux/linux/net/ipv4/netfilter/ipt_TTL.c110
1 files changed, 110 insertions, 0 deletions
diff --git a/release/src/linux/linux/net/ipv4/netfilter/ipt_TTL.c b/release/src/linux/linux/net/ipv4/netfilter/ipt_TTL.c
new file mode 100644
index 00000000..2f0a4e7a
--- /dev/null
+++ b/release/src/linux/linux/net/ipv4/netfilter/ipt_TTL.c
@@ -0,0 +1,110 @@
+/* TTL modification target for IP tables
+ * (C) 2000 by Harald Welte <laforge@gnumonks.org>
+ *
+ * Version: 1.8
+ *
+ * This software is distributed under the terms of GNU GPL
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <net/checksum.h>
+
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_TTL.h>
+
+MODULE_AUTHOR("Harald Welte <laforge@gnumonks.org>");
+MODULE_DESCRIPTION("IP tables TTL modification module");
+MODULE_LICENSE("GPL");
+
+static unsigned int ipt_ttl_target(struct sk_buff **pskb, unsigned int hooknum,
+ const struct net_device *in, const struct net_device *out,
+ const void *targinfo, void *userinfo)
+{
+ struct iphdr *iph = (*pskb)->nh.iph;
+ const struct ipt_TTL_info *info = targinfo;
+ u_int16_t diffs[2];
+ int new_ttl;
+
+ switch (info->mode) {
+ case IPT_TTL_SET:
+ new_ttl = info->ttl;
+ break;
+ case IPT_TTL_INC:
+ new_ttl = iph->ttl + info->ttl;
+ if (new_ttl > 255)
+ new_ttl = 255;
+ break;
+ case IPT_TTL_DEC:
+ new_ttl = iph->ttl - info->ttl;
+ if (new_ttl < 0)
+ new_ttl = 0;
+ break;
+ default:
+ new_ttl = iph->ttl;
+ break;
+ }
+
+ if (new_ttl != iph->ttl) {
+ diffs[0] = htons(((unsigned)iph->ttl) << 8) ^ 0xFFFF;
+ iph->ttl = new_ttl;
+ diffs[1] = htons(((unsigned)iph->ttl) << 8);
+ iph->check = csum_fold(csum_partial((char *)diffs,
+ sizeof(diffs),
+ iph->check^0xFFFF));
+ (*pskb)->nfcache |= NFC_ALTERED;
+ }
+
+ return IPT_CONTINUE;
+}
+
+static int ipt_ttl_checkentry(const char *tablename,
+ const struct ipt_entry *e,
+ void *targinfo,
+ unsigned int targinfosize,
+ unsigned int hook_mask)
+{
+ struct ipt_TTL_info *info = targinfo;
+
+ if (targinfosize != IPT_ALIGN(sizeof(struct ipt_TTL_info))) {
+ printk(KERN_WARNING "TTL: targinfosize %u != %Zu\n",
+ targinfosize,
+ IPT_ALIGN(sizeof(struct ipt_TTL_info)));
+ return 0;
+ }
+
+ if (strcmp(tablename, "mangle")) {
+ printk(KERN_WARNING "TTL: can only be called from \"mangle\" table, not \"%s\"\n", tablename);
+ return 0;
+ }
+
+ if (info->mode > IPT_TTL_MAXMODE) {
+ printk(KERN_WARNING "TTL: invalid or unknown Mode %u\n",
+ info->mode);
+ return 0;
+ }
+
+ if ((info->mode != IPT_TTL_SET) && (info->ttl == 0)) {
+ printk(KERN_WARNING "TTL: increment/decrement doesn't make sense with value 0\n");
+ return 0;
+ }
+
+ return 1;
+}
+
+static struct ipt_target ipt_TTL = { { NULL, NULL }, "TTL",
+ ipt_ttl_target, ipt_ttl_checkentry, NULL, THIS_MODULE };
+
+static int __init init(void)
+{
+ return ipt_register_target(&ipt_TTL);
+}
+
+static void __exit fini(void)
+{
+ ipt_unregister_target(&ipt_TTL);
+}
+
+module_init(init);
+module_exit(fini);