| /* |
| * This is a module which is used for setting the skb->priority field |
| * of an skb for qdisc classification. |
| */ |
| |
| /* (C) 2001-2002 Patrick McHardy <kaber@trash.net> |
| * |
| * 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/ip.h> |
| #include <net/checksum.h> |
| |
| #include <linux/netfilter_ipv4/ip_tables.h> |
| #include <linux/netfilter_ipv4/ipt_CLASSIFY.h> |
| |
| MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
| MODULE_LICENSE("GPL"); |
| MODULE_DESCRIPTION("iptables qdisc classification target module"); |
| |
| static unsigned int |
| target(struct sk_buff **pskb, |
| const struct net_device *in, |
| const struct net_device *out, |
| unsigned int hooknum, |
| const void *targinfo, |
| void *userinfo) |
| { |
| const struct ipt_classify_target_info *clinfo = targinfo; |
| |
| if((*pskb)->priority != clinfo->priority) { |
| (*pskb)->priority = clinfo->priority; |
| (*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) |
| { |
| if (targinfosize != IPT_ALIGN(sizeof(struct ipt_classify_target_info))){ |
| printk(KERN_ERR "CLASSIFY: invalid size (%u != %Zu).\n", |
| targinfosize, |
| IPT_ALIGN(sizeof(struct ipt_classify_target_info))); |
| return 0; |
| } |
| |
| if (hook_mask & ~((1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_FORWARD) | |
| (1 << NF_IP_POST_ROUTING))) { |
| printk(KERN_ERR "CLASSIFY: only valid in LOCAL_OUT, FORWARD " |
| "and POST_ROUTING.\n"); |
| return 0; |
| } |
| |
| if (strcmp(tablename, "mangle") != 0) { |
| printk(KERN_ERR "CLASSIFY: can only be called from " |
| "\"mangle\" table, not \"%s\".\n", |
| tablename); |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| static struct ipt_target ipt_classify_reg = { |
| .name = "CLASSIFY", |
| .target = target, |
| .checkentry = checkentry, |
| .me = THIS_MODULE, |
| }; |
| |
| static int __init init(void) |
| { |
| return ipt_register_target(&ipt_classify_reg); |
| } |
| |
| static void __exit fini(void) |
| { |
| ipt_unregister_target(&ipt_classify_reg); |
| } |
| |
| module_init(init); |
| module_exit(fini); |