patch-2.3.99-pre2 linux/net/ipv4/netfilter/ipt_TOS.c
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- Lines: 88
- Date:
Fri Mar 17 10:56:20 2000
- Orig file:
v2.3.99-pre1/linux/net/ipv4/netfilter/ipt_TOS.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.3.99-pre1/linux/net/ipv4/netfilter/ipt_TOS.c linux/net/ipv4/netfilter/ipt_TOS.c
@@ -0,0 +1,87 @@
+/* This is a module which is used for setting the TOS field of a packet. */
+#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_TOS.h>
+
+EXPORT_NO_SYMBOLS;
+
+static unsigned int
+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_tos_target_info *tosinfo = targinfo;
+
+ if ((iph->tos & IPTOS_TOS_MASK) != tosinfo->tos) {
+ u_int8_t diffs[2];
+
+ diffs[0] = iph->tos;
+ iph->tos = (iph->tos & IPTOS_PREC_MASK) | tosinfo->tos;
+ diffs[1] = iph->tos;
+ iph->check = csum_fold(csum_partial((char *)diffs,
+ sizeof(diffs),
+ iph->check^0xFFFF));
+ (*pskb)->nfcache |= NFC_ALTERED;
+ }
+ return IPT_CONTINUE;
+}
+
+static int
+checkentry(const char *tablename,
+ const struct ipt_entry *e,
+ void *targinfo,
+ unsigned int targinfosize,
+ unsigned int hook_mask)
+{
+ const u_int8_t tos = ((struct ipt_tos_target_info *)targinfo)->tos;
+
+ if (targinfosize != IPT_ALIGN(sizeof(struct ipt_tos_target_info))) {
+ printk(KERN_WARNING "TOS: targinfosize %u != %Zu\n",
+ targinfosize,
+ IPT_ALIGN(sizeof(struct ipt_tos_target_info)));
+ return 0;
+ }
+
+ if (strcmp(tablename, "mangle") != 0) {
+ printk(KERN_WARNING "TOS: can only be called from \"mangle\" table, not \"%s\"\n", tablename);
+ return 0;
+ }
+
+ if (tos != IPTOS_LOWDELAY
+ && tos != IPTOS_THROUGHPUT
+ && tos != IPTOS_RELIABILITY
+ && tos != IPTOS_MINCOST
+ && tos != IPTOS_NORMALSVC) {
+ printk(KERN_WARNING "TOS: bad tos value %#x\n", tos);
+ return 0;
+ }
+
+ return 1;
+}
+
+static struct ipt_target ipt_tos_reg
+= { { NULL, NULL }, "TOS", target, checkentry, THIS_MODULE };
+
+static int __init init(void)
+{
+ if (ipt_register_target(&ipt_tos_reg))
+ return -EINVAL;
+
+ return 0;
+}
+
+static void __exit fini(void)
+{
+ ipt_unregister_target(&ipt_tos_reg);
+}
+
+module_init(init);
+module_exit(fini);
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