![Yasuyuki Kozakai](/assets/img/avatar_default.png)
This replaces IPv4 DSCP target by address family independent version. This also - utilizes dsfield.h to get/mangle DS field in IPv4/IPv6 header - fixes Kconfig help text. Signed-off-by: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
131 lines
3.3 KiB
C
131 lines
3.3 KiB
C
/* 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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* xt_DSCP.c,v 1.8 2002/08/06 18:41:57 laforge Exp
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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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const void *targinfo,
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void *userinfo)
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{
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const struct xt_DSCP_info *dinfo = targinfo;
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u_int8_t dscp = ipv4_get_dsfield((*pskb)->nh.iph) >> XT_DSCP_SHIFT;
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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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ipv4_change_dsfield((*pskb)->nh.iph, (__u8)(~XT_DSCP_MASK),
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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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const void *targinfo,
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void *userinfo)
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{
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const struct xt_DSCP_info *dinfo = targinfo;
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u_int8_t dscp = ipv6_get_dsfield((*pskb)->nh.ipv6h) >> XT_DSCP_SHIFT;
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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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ipv6_change_dsfield((*pskb)->nh.ipv6h, (__u8)(~XT_DSCP_MASK),
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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 targinfosize,
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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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static struct xt_target xt_dscp_reg = {
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.name = "DSCP",
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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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.checkentry = checkentry,
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.family = AF_INET,
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.me = THIS_MODULE,
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};
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static struct xt_target xt_dscp6_reg = {
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.name = "DSCP",
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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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.checkentry = checkentry,
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.family = AF_INET6,
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.me = THIS_MODULE,
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};
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static int __init xt_dscp_target_init(void)
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{
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int ret;
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ret = xt_register_target(&xt_dscp_reg);
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if (ret)
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return ret;
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ret = xt_register_target(&xt_dscp6_reg);
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if (ret)
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xt_unregister_target(&xt_dscp_reg);
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return ret;
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}
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static void __exit xt_dscp_target_fini(void)
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{
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xt_unregister_target(&xt_dscp_reg);
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xt_unregister_target(&xt_dscp6_reg);
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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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