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- /* x_tables module for setting the IPv4/IPv6 DSCP field, Version 1.8
- *
- * (C) 2002 by Harald Welte <laforge@netfilter.org>
- * based on ipt_FTOS.c (C) 2000 by Matthew G. Marsh <mgm@paktronix.com>
- *
- * 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.
- *
- * See RFC2474 for a description of the DSCP field within the IP Header.
- *
- * xt_DSCP.c,v 1.8 2002/08/06 18:41:57 laforge Exp
- */
- #include <linux/module.h>
- #include <linux/skbuff.h>
- #include <linux/ip.h>
- #include <linux/ipv6.h>
- #include <net/dsfield.h>
- #include <linux/netfilter/x_tables.h>
- #include <linux/netfilter/xt_DSCP.h>
- MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
- MODULE_DESCRIPTION("x_tables DSCP modification module");
- MODULE_LICENSE("GPL");
- MODULE_ALIAS("ipt_DSCP");
- MODULE_ALIAS("ip6t_DSCP");
- static unsigned int target(struct sk_buff **pskb,
- const struct net_device *in,
- const struct net_device *out,
- unsigned int hooknum,
- const struct xt_target *target,
- const void *targinfo)
- {
- const struct xt_DSCP_info *dinfo = targinfo;
- u_int8_t dscp = ipv4_get_dsfield((*pskb)->nh.iph) >> XT_DSCP_SHIFT;
- if (dscp != dinfo->dscp) {
- if (!skb_make_writable(pskb, sizeof(struct iphdr)))
- return NF_DROP;
- ipv4_change_dsfield((*pskb)->nh.iph, (__u8)(~XT_DSCP_MASK),
- dinfo->dscp << XT_DSCP_SHIFT);
- }
- return XT_CONTINUE;
- }
- static unsigned int target6(struct sk_buff **pskb,
- const struct net_device *in,
- const struct net_device *out,
- unsigned int hooknum,
- const struct xt_target *target,
- const void *targinfo)
- {
- const struct xt_DSCP_info *dinfo = targinfo;
- u_int8_t dscp = ipv6_get_dsfield((*pskb)->nh.ipv6h) >> XT_DSCP_SHIFT;
- if (dscp != dinfo->dscp) {
- if (!skb_make_writable(pskb, sizeof(struct ipv6hdr)))
- return NF_DROP;
- ipv6_change_dsfield((*pskb)->nh.ipv6h, (__u8)(~XT_DSCP_MASK),
- dinfo->dscp << XT_DSCP_SHIFT);
- }
- return XT_CONTINUE;
- }
- static int checkentry(const char *tablename,
- const void *e_void,
- const struct xt_target *target,
- void *targinfo,
- unsigned int hook_mask)
- {
- const u_int8_t dscp = ((struct xt_DSCP_info *)targinfo)->dscp;
- if ((dscp > XT_DSCP_MAX)) {
- printk(KERN_WARNING "DSCP: dscp %x out of range\n", dscp);
- return 0;
- }
- return 1;
- }
- static struct xt_target xt_dscp_target[] = {
- {
- .name = "DSCP",
- .family = AF_INET,
- .checkentry = checkentry,
- .target = target,
- .targetsize = sizeof(struct xt_DSCP_info),
- .table = "mangle",
- .me = THIS_MODULE,
- },
- {
- .name = "DSCP",
- .family = AF_INET6,
- .checkentry = checkentry,
- .target = target6,
- .targetsize = sizeof(struct xt_DSCP_info),
- .table = "mangle",
- .me = THIS_MODULE,
- },
- };
- static int __init xt_dscp_target_init(void)
- {
- return xt_register_targets(xt_dscp_target, ARRAY_SIZE(xt_dscp_target));
- }
- static void __exit xt_dscp_target_fini(void)
- {
- xt_unregister_targets(xt_dscp_target, ARRAY_SIZE(xt_dscp_target));
- }
- module_init(xt_dscp_target_init);
- module_exit(xt_dscp_target_fini);
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