2006-08-22 07:30:26 +00:00
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/* x_tables module for setting the IPv4/IPv6 DSCP field, Version 1.8
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*
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* (C) 2002 by Harald Welte <laforge@netfilter.org>
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* based on ipt_FTOS.c (C) 2000 by Matthew G. Marsh <mgm@paktronix.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* See RFC2474 for a description of the DSCP field within the IP Header.
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*/
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <net/dsfield.h>
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#include <linux/netfilter/x_tables.h>
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#include <linux/netfilter/xt_DSCP.h>
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MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
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MODULE_DESCRIPTION("x_tables DSCP modification module");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("ipt_DSCP");
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MODULE_ALIAS("ip6t_DSCP");
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static unsigned int target(struct sk_buff **pskb,
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const struct net_device *in,
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const struct net_device *out,
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unsigned int hooknum,
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const struct xt_target *target,
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2006-08-22 07:35:47 +00:00
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const void *targinfo)
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2006-08-22 07:30:26 +00:00
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{
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const struct xt_DSCP_info *dinfo = targinfo;
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2007-04-21 05:47:35 +00:00
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u_int8_t dscp = ipv4_get_dsfield(ip_hdr(*pskb)) >> XT_DSCP_SHIFT;
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2006-08-22 07:30:26 +00:00
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if (dscp != dinfo->dscp) {
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if (!skb_make_writable(pskb, sizeof(struct iphdr)))
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return NF_DROP;
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2007-04-21 05:47:35 +00:00
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ipv4_change_dsfield(ip_hdr(*pskb), (__u8)(~XT_DSCP_MASK),
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2006-08-22 07:30:26 +00:00
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dinfo->dscp << XT_DSCP_SHIFT);
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}
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return XT_CONTINUE;
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}
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static unsigned int target6(struct sk_buff **pskb,
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const struct net_device *in,
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const struct net_device *out,
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unsigned int hooknum,
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const struct xt_target *target,
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2006-08-22 07:35:47 +00:00
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const void *targinfo)
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2006-08-22 07:30:26 +00:00
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{
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const struct xt_DSCP_info *dinfo = targinfo;
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2007-04-26 00:54:47 +00:00
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u_int8_t dscp = ipv6_get_dsfield(ipv6_hdr(*pskb)) >> XT_DSCP_SHIFT;
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2006-08-22 07:30:26 +00:00
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if (dscp != dinfo->dscp) {
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if (!skb_make_writable(pskb, sizeof(struct ipv6hdr)))
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return NF_DROP;
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2007-04-26 00:54:47 +00:00
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ipv6_change_dsfield(ipv6_hdr(*pskb), (__u8)(~XT_DSCP_MASK),
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2006-08-22 07:30:26 +00:00
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dinfo->dscp << XT_DSCP_SHIFT);
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}
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return XT_CONTINUE;
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}
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static int checkentry(const char *tablename,
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const void *e_void,
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const struct xt_target *target,
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void *targinfo,
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unsigned int hook_mask)
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{
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const u_int8_t dscp = ((struct xt_DSCP_info *)targinfo)->dscp;
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if ((dscp > XT_DSCP_MAX)) {
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printk(KERN_WARNING "DSCP: dscp %x out of range\n", dscp);
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return 0;
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}
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return 1;
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}
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2006-08-22 07:34:04 +00:00
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static struct xt_target xt_dscp_target[] = {
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{
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.name = "DSCP",
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.family = AF_INET,
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.checkentry = checkentry,
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.target = target,
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.targetsize = sizeof(struct xt_DSCP_info),
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.table = "mangle",
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.me = THIS_MODULE,
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},
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{
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.name = "DSCP",
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.family = AF_INET6,
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.checkentry = checkentry,
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.target = target6,
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.targetsize = sizeof(struct xt_DSCP_info),
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.table = "mangle",
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.me = THIS_MODULE,
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},
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2006-08-22 07:30:26 +00:00
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};
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static int __init xt_dscp_target_init(void)
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{
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2006-08-22 07:34:04 +00:00
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return xt_register_targets(xt_dscp_target, ARRAY_SIZE(xt_dscp_target));
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2006-08-22 07:30:26 +00:00
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}
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static void __exit xt_dscp_target_fini(void)
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{
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2006-08-22 07:34:04 +00:00
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xt_unregister_targets(xt_dscp_target, ARRAY_SIZE(xt_dscp_target));
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2006-08-22 07:30:26 +00:00
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}
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module_init(xt_dscp_target_init);
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module_exit(xt_dscp_target_fini);
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